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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.
Seems not. Please specify "some other languages".
no, you don't have to.
you can solve it with an 100-sized array, but it is not the only way.