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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.
"..palindrome that could be made by combining the characters in any order BUT USING EACH CHARACTER ONLY ONCE". From my understanding, we can use each character how many ever times it occurs in the string and not just once.