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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 was worth remembering about bitwise operators after I saw the others' solutions, because initially I forgot about them.
Impressive how you managed to do it without use of any bitwise operators
No need to call str() so many times
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Slightly more readable, imo.
why?