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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.
That's most probably because you use
eval, and it chokes on inputs like'-7715?5--484?00=-28?9?5'(JS parsing rules treat--as post-decrement). Does this input work for you locally?It's a bug in your solution, and not a kata issue.