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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.
Each strand has a unique capital letter. Note how in the tests, the strands will always be connected but may traverse different inner-arrays.
All Cs will be part of the same strand even if it twists and turns.
Handling negative inputs isn't part of the spec.