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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.
I think yours is O(n^2) for worst case too, because once you look at all the chars of text, then you check all the elements of your dict.
strange, because it does work for me. Try str(n) instead of n