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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.
Why is user unable to use ruby Prime class? Also: "user should assume that he will get only integer numbers in input", what can be confuing since all inputs are fixnums, so he cannot use Integer class methods.