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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.
Good catch. I fixed and added test cases for "90, 180" and "-90, -180".
agreed.
p.s. my bad I didn't know tagging as issue would have any other consequences
I think it would make it slightly more interesting to require different characters inside the triangle vs outside (e.g. spaces inside vs underscores outside)