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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 like how intuitive this is, just it is very wasteful in computation.
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"*" is a string. The kata should define what it means by 'string' and shouldn't use the term string.
I think it would be clearer if the description reads as "... that are equal to THE NUMBER one in the binary....". I initially interpreted the description as "... that are equal to the ones in the binary..."