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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.
This looks a little bit like the problem I was having. If you're doing player1.zip(player2), you need to check whether player2 is longer, and if so, do player2.zip(player1).map(&:reverse), because otherwise the extra elements in player2 won't get zipped.