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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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Maybe, but there's a bigger learning curve to go from an imperative language -> haskell than there is to code this in an imperative language that
either doesn't have support to make this trivial (or where that support isn't permitted)
Therefore the only people who should get an easy time, perhaps, are those for whom haskell is their first language.