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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.
Incomplete solution. It may work in the simplest case, but does not cover all possibilities given the limited explanation. The mouse could appear before the cat, or there could be preceeding or trailing periods.