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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.
Get started now by creating a new collection.
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By far the best solution!
I solved the problem in Haskell using a list comprehension and saw a lot of solutions using 'filter'. In general, would filter be preferred over a list comprehension due to its high-level simplicity, or does it not really matter?