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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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c++ in c hashtag is crazy
I also thought about this problem.
One solution to deal with it is to remove repeated characters from the original string then test on the new string.