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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.
It doesn't pass, so this solution isn't correct
hey guys, can you explain why this one passes if for example a or b !== 'number'? Isn't that supposed to return us NaN for valid signs?