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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.
There is always a consideration between using memory and speed. You should know that finding an index of a character in a string takes 0(n), compared to using a dictionary to store already computed values. Knowledge before commenting is crucial!