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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.
After reviewing the answers I can say, with a high degree of certainty, that sexy_primes(21,27) and sexy_primes(16,22) returns false ie. there is a method in the test casses (which we will call method_x for now) which determines whether or not your answer is correct by doing "Test.assert_equals(sexy_primes(x,y), method_x(x,y))". When testing method_x(21,27) and method_x(16,22), the method returned False for both the Javascript and Python languages.