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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.
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Agreed. In fact you can avoid taking square roots by just making sure that x*x <= n for every x you check. The only issue is that you have to sort the list at the end since appending x and then n/x will not result in a sorted list.
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