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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.
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I've edited the description to make this clear just in case.
1321 doesn't contain 121. Nowhere in the description does it say to permutate the input.
I don't understand, 1321 also contains palindrome(121) and the test should return False.
because it contains a palindrome :
121! ;)