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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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Note: python 2 only
Too slow.It my take O(n2) time.
I'm confused why so many people upvote this answer.
Try to use hash
Can it be slower when using excetion as loop?