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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 agree and there should be a hint for the spaces in some of the tests. Also, leading zeros are mentioned in the instructions as invalid, but there acctually are no tests checking for them.
Not 2^32, but 2^8 states ranging from 0 to 255.