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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.
You are right! Thx.
Instead of puting to map and checking every time if character is already in that map you can just put it to set (set does not have duplicates)