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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.
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There are a lot of solutions seeming not to fit the description perfectly.
Agree. More like a 7 or even an 8.
For me, this solutin means that the coder realy understands the rationale of binay, although probably it isn't the best way to do binary.