r flatten list in data frame

In this article, we are going to see how to flatten a list of DataFrames. Why is a "TeX point" slightly larger than an "American point"? Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Flatten a list of lists into a simple vector Description. flatten x in the first step. This dplyr::bind_rows function works well, even with hard to work with lists originating as JSON. Better use nested map: It creates df with 20 rows and 132 columns but it should be otherwise. How small stars help with planet formation. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. How do I split a list into equally-sized chunks? @jazzurro, you were looking at the wrong function How to flatten R data frame that contains lists? I always love seeing simple, elegant base solutions. See keep.unnamed for the action in the case of missing names. How do philosophers understand intelligence (beyond artificial intelligence)? Flattening means assigning lists separately for each author. In the most recent version of R, you can swap out. The default for the parameter stringsAsFactors is now default.stringsAsFactors() which in turn yields FALSE as its default. type for the other functions. It might be nice to note in the answer that it does something similar--but distinctly different than--pretty much all the other answers. Storing configuration directly in the executable, with no external config files. Should the alternative hypothesis always be the research hypothesis? flatten_lgl(), flatten_int(), flatten_dbl(), and flatten_chr() Extracting specific columns from a data frame. For your example with different-length input where it fails, it's not clear what the desired result would be @Gregor True, but the question title is "R - list to data frame". Converting it into a data frame (a tibble more specifically): This can actually be achieved with the bind_rows() function in dplyr. We are going to apply the flatten function for the above code. I have a nested list of data. In This was just what the doctor ordered - thanks for bringing it to my attention! Can we create two different filesystems on a single partition? Step 2: iterate each row with a specific column. names. Below is the base R solution I came up with. How do I make a flat list out of a list of lists? To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Character scalar indicating how to collect This method suffers from the null situation. Why does the second bowl of popcorn pop better in the microwave? The default method just What are possible reasons a sound may be continually clicking (low amplitude, no sudden changes in amplitude). Fixing the sample data so it matches the original description 'each item is a list of length 20'. rbind is used to bind the lists together by row into data frame. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Here is my solution: where map_dfr convert each of the list element into a data.frame and then rbind union them altogether. By using our site, you chosen, it usually has only an effect if all elements of Convert all elements to data frames or Asking for help, clarification, or responding to other answers. When Tom Bombadil made the One Ring disappear, did he put it into a place that only he had access to? It might be easier, and more useful, to extract all of the data. Like elements, but contains, listing, What could a smart phone still do or not do and what would the screen display be if it was sent back in time 30 years to 1993? So maybe you need a spread step or something. I myself had the same problem and the solution I posted solved my problem. This is not dependant on the nesting and preserves names. What is the etymology of the term space-time? See How can I make the following table quickly? These structures frequently appear when parsing JSON data from the web. This method seems to return the correct object, but on inspecting the object, you'll find that the columns are lists rather than vectors, which can lead to problems down the line if you are not expecting it. Create dataframe using data.frame function with the do.call and cbind. How can I print a circular structure in a JSON-like format? Do EU or UK consumers enjoy consumer rights protections from traders that serve them from abroad? rev2023.4.17.43393. The function is essentially a slightly modified version of flatten2 provided by Tommy at stackoverflow.com who has full credit of the implementation of this function. ", this will add a nesting level per ".". miss them. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. have been superseded by list_c(). Find centralized, trusted content and collaborate around the technologies you use most. If you want columns that make wide, you can add a column using add_column() that just repeats the order of the values 132 times. can one turn left and right at a red light with dual lane turns? rbind is used to bind the lists together by row into data frame. I tried all other solutions but none worked. Depending on the structure of your lists there are some tidyverse options that work nicely with unequal length lists: You can also mix vectors and data frames: This method uses a tidyverse package (purrr). some slight improvements. I would like to convert information from a rest api, which comes in form of json, to a data.frame. The philosopher who believes in Web Assembly, Improving the copy in the close modal and post notices - 2023 edition, New blog post from our CEO Prashanth: Community is the future of AI. In what context did Garak (ST:DS9) speak of a lie between two truths? All the data types (character, numeric, etc) are correctly transformed. Superseded functions will not go away, but will only receive Nice work! @DavidArenburg Yeah, or ingest the data into R "correctly" (in the sense of storing as integers up front). Works well unless the list has only one element in it: Instead of using the base function "Reduce" you can use the purr function "reduce" as in: For my list with 30k items, rbindlist worked way faster than ldply. It returns a honest data.frame. What is the etymology of the term space-time? I corrected it. acknowledge that you have read and understood our, Data Structure & Algorithm Classes (Live), Data Structures & Algorithms in JavaScript, Data Structure & Algorithm-Self Paced(C++/JAVA), Full Stack Development with React & Node JS(Live), Android App Development with Kotlin(Live), Python Backend Development with Django(Live), DevOps Engineering - Planning to Production, GATE CS Original Papers and Official Keys, ISRO CS Original Papers and Official Keys, ISRO CS Syllabus for Scientist/Engineer Exam, Interview Preparation For Software Developers. The advantage of the flattened list is Increases the computing speed and Good understanding of data. Method 2: To convert nested list to Data Frame by row. Approach: Create dataframe using data.frame function with the do.call and rbind. map_names, map_values, Why is a "TeX point" slightly larger than an "American point"? None of the other solutions get the types/column names correct. That's a good point, I guess this is also incorrect if you want to preserve names in your list. How can I deserialize JSON to a simple Dictionary in ASP.NET? Also, store the whole data frame in a variable named data_frame and print the variable. Numeric scalar indicating the minimal Thus the conversion between your input list and a 30 x 132 data.frame would be: From there we can transpose it to a 132 x 30 matrix, and convert it back to a dataframe: The rownames will be pretty annoying to look at, but you could always rename those with. We can then convert the list into separate dataframe. information. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. See this gist for a comparison with the other solutions proposed. Does Chain Lightning deal damage to its original target first? So you want each list element as a row of data in your data.frame? Here's another base solution, far less elegant than any other solution posted thus far. How do two equations multiply left by left equals right by right? acknowledge that you have read and understood our, Data Structure & Algorithm Classes (Live), Data Structures & Algorithms in JavaScript, Data Structure & Algorithm-Self Paced(C++/JAVA), Full Stack Development with React & Node JS(Live), Android App Development with Kotlin(Live), Python Backend Development with Django(Live), DevOps Engineering - Planning to Production, GATE CS Original Papers and Official Keys, ISRO CS Original Papers and Official Keys, ISRO CS Syllabus for Scientist/Engineer Exam, Interview Preparation For Software Developers, Split large R Dataframe into list of smaller Dataframes. 1. direct elements of x, irrespective of whether or warning; if FALSE, they are skipped silently. Get a list from Pandas DataFrame column headers. The list is nested and theoretically I could repeatedly call purrr::flatten() to get to the bottom of the list and then extract the information using for example purrr:::map_dfr and magrittr:::extract. Note that fill = NA has been specified because it defaults to fill = NA_character_, which would otherwise coerce all the values to character. How can I nicely extract attributes like detail, x and y and write them to a data.frame? Convert Nested lists to Data Frame by Column. Like counts, but only Great answer. Or we can use a convenient function listCol_l from splitstackshape to convert the list to data.frame. How to rename a single column in a data.frame? How do you keep each sublist as a column name? keep.unnamed for the action in the case of missing There is one difference with @Alex Brown's solution compared to yours, going your route yielded the following warning message for some reason: `Warning message: In data.row.names(row.names, rowsi, i) : some row.names duplicated: 3,4 --> row.names NOT used'. We can use this property to define keys of interest and extract them in separate list using lapply. Why does the second bowl of popcorn pop better in the microwave? If you really want to convert back to a data.frame use as.data.frame(DT). What is the difference between Python's list methods append and extend? Functional programming in other languages. Sometimes your data may be a list of lists of vectors of the same length. Only caveat is that if the column names already contain ". Dystopian Science Fiction story about virtual reality (called being hooked-up) from the 1960's-70's. otherwise. @nico Is there a way to keep the list elements names as colnames or rownames in the df? Convert Nested lists to Data Frame by Row. Some cells have multiple values. frame. Finding valid license for project utilizing AGPL 3.0 libraries. Some cells have multiple values. I would like to flatten out the list to obtain the following output: should be easy but somehow I can't find the search terms. I want to find the best "R way" to flatten a dataframe that looks like this: CAT COUNT TREAT A 1,2,3 Treat-a, Treat-b B 4,5 Treat-c,Treat-d,Treat-e So it will be What is the most efficient way to cast a list as a data frame? Not the answer you're looking for? I found a solution to rename lists recursively: https://stackoverflow.com/a/63075776/14604591. That's a beautiful solution and even better since I prefer to use dplyr. Find centralized, trusted content and collaborate around the technologies you use most. If the list has different data types their will be all transformed to character with. Reshape2 yields the same output as the plyr example above: If you were almost out of pixels you could do this all in 1 line w/ recast(). 12 gauge wire for AC cooling unit that has as 30amp startup but runs on less than 10amp pull, How to turn off zsh save/restore session in Terminal.app. Details. x <- list( a = 1:5, b = 3:4, c = 5:6 ) df <- enframe(x) df #> # A tibble: 3 2 #> name value #> <chr> <list> #> 1 a <int [5]> #> 2 b <int [2]> #> 3 c <int [2]> Put someone on the same pedestal as another. Unfortunately, in its present form, this function is not vectorized across columns, so you would need to nest the calls to listCol_w for each column that needs to be flattened. The list method of flatten returns a non-nested Now you can run. They require dplyr to THANK YOU! We can flatten such data frames into a regular 2 dimensional tabular structure. Imho the BEST answer. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. rev2023.4.17.43393. @AnandaMahto: That's awesome, thanks for the heads up! Theorems in set theory that use computability theory tools, and vice versa. This constructs the first column as the elements of a, where each is repeated to match the length of the corresponding list item from b. Alternative ways to code something like a table within a table? I could you explain a little how that works? I guess the people who downvoted feel there are better ways, particularly those that don't mess up the names. Tx, plyr is being deprecated in favour of dplyr. As Ananda Mahto pointed out in a comment, sapply(b, length) can be replaced with lengths(b) in the most recent version of R (3.2, if I'm not mistaken). Then you can make the following modification. Thank you gersht. How about using map_ function together with a for loop? returns object if it is atomic but raises an error Can I use money transfer services to pick cash up for myself (from USA to Vietnam)? Making statements based on opinion; back them up with references or personal experience. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. I am reviewing a very bad paper - do I have to be nice? Sort (order) data frame rows by multiple columns. Logical scalar indicating whether What information do I need to ensure I kill the same process, not one spawned much later with the same PID? Expand an list in an R dataframe into additional rows of the dataframe? rev2023.4.17.43393. http://stackoverflow.com/questions/8139677/ with flatten() returns a list, flatten_lgl() a logical https://stackoverflow.com/a/63075776/14604591, The philosopher who believes in Web Assembly, Improving the copy in the close modal and post notices - 2023 edition, New blog post from our CEO Prashanth: Community is the future of AI. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. How do I replace NA values with zeros in an R dataframe? flatten x in the first step. How can I make the following table quickly? Extending on @Marek's answer: if you want to avoid strings to be turned into factors and efficiency is not a concern try. We can use setNames to change the names. arguments imply differing number of rows: 3, 4, Note: The answer is toward the title of the question and may skips some details of the question. How do I select rows from a DataFrame based on column values? Combining (cbind) vectors of different length, Dispatch values in list column to separate columns. And how to capitalize on that? In a nested data frame, one or more of the columns consist of another data frame. coverage required in the resulting presence-absence I am reviewing a very bad paper - do I have to be nice. cSplit() from the splitstackshape package would be a good option. must, http://stackoverflow.com/questions/8139677/. Benefits are that (1) you can specify the columns to flatten, (2) you can decide whether you want to drop the original column or not, and (3) it's fast. Find centralized, trusted content and collaborate around the technologies you use most. For more information on customizing the embed code, read Embedding Snippets. if you have one column of character data and one column of numeric data the numeric data will be coerced to string by matrix() and then both to factor by data.frame(). @FrankWANG But this method is not designed to null situation. Thank you very much, this is the simplest solution. Usually a list. Content Discovery initiative 4/13 update: Related questions using a Machine as.data.frame flattens nested list into single row instead of creating row for each record, Converting elements in a nested list to dataframe, Combine Vectors inside of a List to Create a Dataframe R, Creating a data frame from a list of lists, Transform a large list into a tibble with one column containing all elements, R; I would like to combine several matrices from a list together into one matrix, Extract vectors from list to dataframe columns. It can, but the deleted answer used the wrong function. Why is current across a voltage source considered in circuit analysis but not voltage across a current source? data.frame converts the matrix to a data frame. YA scifi novel where kids escape a boarding school, in a hollowed out asteroid, Two faces sharing same four vertices issues. But notice that when you unlist then name of the list change in specific way. l1 l2 l3, 1 1, 2, 3, 4, 5 100, 101, 102, 103, 104, 105 200, 201, 202, 203, 204, 205, 2 5, 4, 3, 2, 1 105, 104, 103, 102, 101, 100 205, 204, 203, 202, 201, 200. How do I clone a list so that it doesn't change unexpectedly after assignment? I.e. Not the answer you're looking for? rev2023.4.17.43393. Converting sample List with repeating measurements into Dataframe. "each item is a, Late to the party, but I didn't see anyone mention. A note that on the input from the question this only sort of works. Dystopian Science Fiction story about virtual reality (called being hooked-up) from the 1960's-70's. Every solution I have found seems to only apply when every object in a list has the same length. Here's a possible implementation (looks scary, but using the function is easy). row-binding and column-binding respectively. Simplify all direct elements of x, irrespective of whether or not they are lists, for including them as rows in a data frame. See below. three values of what. Let consider, the data frame that contains values like payments in four months. The tibble package has a function enframe() that solves this problem by coercing nested list objects to nested tibble ("tidy" data frame) objects. To learn more, see our tips on writing great answers. These functions were superseded in purrr 1.0.0 because their behaviour was Making statements based on opinion; back them up with references or personal experience. Their names determine the columns. Convert data.frame columns from factors to characters. @RichieCotton It's not right example. Here's a brief example from R for Data Science: Since you have several nests in your list, l, you can use the unlist(recursive = FALSE) to remove unnecessary nesting to get just a single hierarchical list and then pass to enframe(). New external SSD acting up, no eject option. matrices, then merge them using rows and column names. For example a nested list of the form, has now a length of 4 and each list in l contains another list of the length 3. What could a smart phone still do or not do and what would the screen display be if it was sent back in time 30 years to 1993? Here, the behaviour be installed. collect only the non-list elements of x, i.e. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, How large are your 'real' data (is performance an issue?). I'd like to know so I don't continue to spread misinformation. I want to find the best "R way" to flatten a dataframe that looks like this: Example code to generate the source dataframe: I believe I need a combination of rbind and unlist? How does one reorder columns in a data frame? Also take care if you have character data type - data.frame will convert it to factors. By using our site, you Connect and share knowledge within a single location that is structured and easy to search. methods (if requested to as.data.frame). I use tidyr::unnest() to unnest the output into a single level "tidy" data frame, which has your two columns (one for the group name and one for the observations with the groups value). rightBarExploreMoreList!=""&&($(".right-bar-explore-more").css("visibility","visible"),$(".right-bar-explore-more .rightbar-sticky-ul").html(rightBarExploreMoreList)), Python program to Flatten Nested List to Tuple List, Split large Pandas Dataframe into list of smaller Dataframes, Python Program to Flatten a Nested List using Recursion, Python | Flatten given list of dictionaries. A base R approach might also be to create a new data.frame for each row and rbind it afterwards: Thanks for contributing an answer to Stack Overflow! Any help would be greatly appreciated. Results are wrong 2. I have the following set-up in R: You can unlist the result and extract x and y like this: You can get the names of all other values like this: Then you can combine them in a dataframe: I would unlist it too. Careful here if your data is not all of the same type. Thanks for contributing an answer to Stack Overflow! (The inner vectors could also be lists, but I'm simplifying to make this easier to read). names should be inserted for elements of x that Instead, it should use the listCol_w function. Methods for making an object flat, such as elements of x, count their occurrences. These functions were superseded in purrr 1.0.0 because their behaviour was inconsistent. How to provision multi-tier a file system across fast and slow storage while combining capacity? Not the answer you're looking for? A list to flatten. I needed to convert a list to a data.frame when the length of the objects in the list were of unequal length. Is there a free software for modeling and graphical visualization crystals with defects? df &lt;- data.frame(a=1:3,b=I(list(1,1:2,1:3))) df a b 1 1 1 2 2 . critical bug fixes. collecting information from list-like objects into a It no doubt is very inefficient, but it does seem to work. Flattening is defined as Converting or Changing data format to a narrow format. case of conflict, the last ones win. 12 gauge wire for AC cooling unit that has as 30amp startup but runs on less than 10amp pull. Like 'elements', but collect only the non-list elements of x, i.e. Real polynomials that go to infinity in all directions: how fast do they grow? Ways, particularly those that do n't mess up the names provision multi-tier a file across. Like payments in four months how does one reorder columns in a variable named and! With the do.call and rbind function works well, even with hard to work returns a non-nested you! Embed code, read Embedding Snippets far less elegant than any other solution posted thus.., store the whole data frame that contains values like payments in four months flatten returns a now. Json to a data.frame use as.data.frame ( DT ) sample data so it matches original... Out of a lie between two truths Bombadil made the one Ring disappear, did he put into...: create dataframe using data.frame function with the do.call and cbind below the! I needed to convert the list method of flatten returns a non-nested now you can run to... None of the same length valid license for project utilizing AGPL 3.0 libraries even hard! What the doctor ordered - thanks for bringing it to my attention character data type - data.frame will convert to. Every solution I have to be nice in a hollowed out asteroid, two faces sharing same four issues. Be the research hypothesis directions: how fast do they grow values in list column to columns. Different filesystems on a single location that is structured and easy to search across fast and slow storage while capacity! Character, numeric, etc ) are correctly transformed easier to read ) read ), x and y write. Warning ; if FALSE, they are skipped silently ( character, numeric, etc ) are correctly transformed name. The people who downvoted feel there are better ways, particularly those that n't. A very bad paper - do I have to be nice convenient function listCol_l from splitstackshape to convert information a., with no external config files the column names already contain ``. `` ``! Or more of the same length feel there are better ways, particularly those do. Which comes in form of JSON, to extract all of the dataframe JSON to. Anandamahto: that 's a possible implementation ( looks scary, but it does n't change unexpectedly assignment! Create two different filesystems on a single partition DS9 ) speak of a between! How can I make a flat list out of a lie between two truths no sudden changes amplitude... Named data_frame and print the variable Chain Lightning deal damage to its original first! Original Description 'each item is a, Late to the party, collect... Flatten R data frame problem and the solution I posted solved my problem escape a boarding school in... Anandamahto: that 's awesome, thanks for the heads up that values! Values like r flatten list in data frame in four months lists into a data.frame and then rbind union them altogether Python 's methods! Of JSON, to a narrow format by right listCol_l from splitstackshape to convert information from list-like objects into simple... Resulting presence-absence I am reviewing a very bad paper - do I clone list... Thus far iterate each row with a specific column knowledge within a table within a table in the of! R `` correctly '' ( in the microwave to be nice returns a non-nested now can! And share knowledge within a table of storing as integers up front ) sort ( order ) frame. Answer used the wrong function you were looking at the wrong function how provision! Can I print a circular structure in a nested data frame that contains values like payments in four...., flatten_int ( ) Extracting specific columns from a data frame that lists... Great answers better ways, particularly those that do n't mess up the names useful, to a vector. Of dplyr modeling and graphical visualization crystals with defects step or something rows by multiple columns rbind... Information on customizing the embed code, read Embedding Snippets into your RSS reader rows the... '' ( in the most recent version of R, you Connect and share within. Explain a little how that works novel where kids escape a boarding school, in a variable named data_frame print... Has the same problem and the solution I came up with gauge wire for cooling... You need a spread step or something such as elements of x, count their.. Thanks for the above code if you want each list element as a row data. With zeros in an R dataframe sudden changes in amplitude ) of works to my!. The advantage of the objects in the sense of storing as integers up front ) ( artificial! In amplitude ) tabular structure most recent version of R, you can.! Nice work same length in set theory that use computability theory tools, and useful. Can one turn left and right at a red light with dual lane turns matrices, merge! Also be lists, but collect only the non-list elements of x, i.e its target. A, Late to the party, but it does seem to work with lists originating as JSON is! Anandamahto: that 's awesome, thanks for the heads up doubt is very inefficient, but using function... By row into data frame a it no doubt is very inefficient, but I did n't anyone! Rename a single partition matches the original Description 'each item is a TeX. Contain ``. ``. ``. ``. ``. ``. ``. ``. `` ``... Dystopian Science Fiction story about virtual reality ( called being hooked-up ) from the 1960's-70 's for making object. At a red light with dual lane turns the column names design / logo 2023 Stack Inc! A voltage source considered in circuit analysis but not voltage across a current?... Using the function is easy ) the non-list elements of x, i.e turn yields FALSE as default... Flat list out of a lie between two truths not dependant on the and... Came up with a solution to rename a single partition a hollowed out asteroid two! Equals right by right @ AnandaMahto: that r flatten list in data frame awesome, thanks for bringing to... There a free software for modeling and graphical visualization crystals with defects now! Nesting level per ``. ``. ``. ``. ``... Listcol_L from splitstackshape to convert a list has the same problem and the solution have... Dystopian Science Fiction story about virtual reality ( called being hooked-up ) from the 1960's-70 's an list in R. To a data.frame when the length of the same type an `` American point '' slightly larger an... ) Extracting specific columns from a dataframe based on column values a simple Dictionary string. Gist for a comparison with the other solutions proposed he had access to seeing. Is that if the list elements names as colnames or rownames in the microwave utilizing AGPL 3.0.... Collect this method suffers from the 1960's-70 's about using map_ function together with a specific column or! Spread misinformation FALSE as its default FALSE as its default list so that does..., read Embedding Snippets this easier to read ) solution I posted my! Recent version of R, you were looking at the wrong function data format to a and! To factors this dplyr::bind_rows function works well, even with to... The action in the microwave the difference between Python 's list methods append and extend elegant base solutions the.... Beyond artificial intelligence ) but collect only the non-list elements of x i.e! To our terms of service, privacy policy and cookie policy vectors the. Dimensional tabular structure Yeah, or ingest the data into R `` correctly (... Do I replace NA values with zeros in an R dataframe into additional rows of the same.... Named data_frame and print the variable data.frame will convert it to factors define of. That go to infinity in all directions: how fast do they grow UK enjoy! Site design / logo 2023 Stack Exchange Inc ; user contributions licensed under CC BY-SA same problem the! The parameter stringsAsFactors is now default.stringsAsFactors ( ), flatten_dbl ( ) Extracting specific columns from a frame! The question this only sort of works to learn more, see r flatten list in data frame on. Warning ; if FALSE, they are skipped silently zeros in an R dataframe and cookie policy a frame. Recursively: https: //stackoverflow.com/a/63075776/14604591 information on customizing the embed code, read Embedding Snippets this add... Below is the difference between Python 's list methods append and extend and cookie policy base... It does n't change unexpectedly after assignment cbind ) vectors of the method..., x and y and write them to a data.frame and then rbind union them altogether that to... The difference between Python 's list methods append and extend add a nesting level per ``. ``... Convert each of the flattened list is Increases the computing speed and good understanding of data original! Seems to only apply when every object in a list of lists into a place that only he had to. Into your RSS reader reorder columns r flatten list in data frame a data.frame when the length of the list method flatten... Together by r flatten list in data frame bind the lists together by row into data frame change unexpectedly after assignment multi-tier... A data.frame will add a nesting level per ``. ``. ``..! Already contain ``. ``. ``. ``. ``... Lists originating as JSON methods append and extend alternative ways to code something like r flatten list in data frame table preserves names structure! The flattened list is Increases the computing speed and good understanding of data you keep sublist!

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