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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.
Maybe I misunderstood something, but the number of pairs you want should not exceed the number of pairs that we have ( [5, 44, 50, 2372]) how can we get 50 pairs if there are only 5? Even if there was something else, how to get 2372 as a result if the total number of socks is 5*44=220?