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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.
exactly )
XXIis 21XIXis 19EDIT: I see, it returns
21for bothfails XIX and XXI , all are 21
the most beautiful thing I saw for last time! Great! but how it passed Integer Division test?