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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.
It is bitwise shift left. So if you shift by one, is equivalent to multiply by 2.
This solution can be nice here to see, but not in real world: it is not very readable IMO.