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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.
Yes. Any recursive function will give a stackoverflow when there's too much recursion.
will this experience the stackoverflow error when too many digits?
Strongly agree with this one. as it make the tryCode to be a simple function without the need of caching the previous guesses.