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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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Because the question is not whether a number is a palindrome.
palindrome(141221001) => true
palindrome(1215) => true
Why should these numbers return True if they are not palindromes?