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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.
"Note: make sure all the binary numbers have a length of 3"
And what are we supposed to do if it isn't?
I don't understand the reason for the note, it's not as we can get invalid input from the tests.