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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
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Could anyone explain why an empty string is found in a string 'aeiou' but not in the same string within a set? Thanks in advance.
+1 @PomPolock, I wrote the lambda until I realized I had to list() the filter object. Then re-wrote as a list comprehension. Surprised that the testing structure doesn't let you check for the method used (see https://www.codewars.com/kata/59441520102eaa25260000bf).