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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.
Arguably if there are multiple species, for example, domesticated sheep and Mouflon, then sheeps could be condidered correct, just as fishes is accurate to describe groups of fish containing multiple species.