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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.
Already raised as issue
would this benefit from a test like:
"1??+1??=2??"
in order to test for the leading zeros condition you can currently check if expression contains "??" but that shouldn't guarantee that those are leading digits.
Stolen lol, I like how you tried to only loop through once.