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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.
@vdv73rus
This is 8 kyu for a reason mate.
Apparently you're not meant to change the order of the numbers so have to use a, b and c in that order.
Sample tests are not so correct. My solution returns bigger result!