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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.
The test is correct since the expected answer is "ERROR: VERSION or PHONE."
the algorithm of your isPrime seem good
but goes too deep I guess.
Hint: You don't need to check from 2 to n
Your
isPrime
function is too slow.