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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.
I used print instead of return,it solved.just use return :) <3
it's buggy,my output is same as the answer but it shows faild
even I changed type of output to list or string,it steel feedback an faild