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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.
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This kata is not about primes but about "relatively prime". Where do you read anything about 1 considered a prime in this kata? Description only talks about factors and divisors.
PauL didn't won:
PauL ended in the 4th place.
Please read two posts below yours.