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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.
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That can be a false positive if you have words that have all the same letters, but not necessarily the same count of each letter.
"headed" versus "ahead"
'in' is wrong in this case, you only want to check the last character. And yes, endswith should be faster, it only checks the end of the string ('in' will check the whole string).