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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.
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I think the problem with 191/373 is that they required nargs >= 2; hence you had to work with the product of 373 and the other one, but correct me if I'm wrong.
Description included more or less straight-up description of algorithm; not too interesting then to implement it.