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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.
The grammar part is pain, and why should
0be followed by a plural word (dollars, cents) while0itself isn't plural at all?it's actually a duplicate of many other katas that require the very same operation/function. Yes, the context is a bit funny, but it's still a duplicate.