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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.
No need for parentheses as 'and' has priority over 'or'. Readability for humans suffer though :)
Ah, true. Had to read that three times to notice that.
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This one has recursion written all over it. Too bad I suck at recursion :D