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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.
I love this one. So straight-forward!
It's only a prime gap if there are no other primes in between, which rules out 101, 107 (since 103 sits in the middle).