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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 did almost the same thing. Your code is good, deserves more upvotes
Thats the way a bodies suppose to be.
This looks like the same as the one that has more upvotes above.... just missing the comments.
Won't it include "aaab" for word "abba"? They both have same length and same characters set...