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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.
a gap means that there are no prime numbers in between. think about it :)
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I had the same exact answer, but it did not pass one test case due to taking longer than 12000ms
still having issues with the c# one