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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's just the opposite.
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look for recursive functions
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It's because 'string1' * 'string2' causes both strings to be converted to numbers and then multiplied. (it's the
*operator that forces this conversion, as do-and/, but not+, which does string concatenation)