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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.
Because it breaks the loop as soon as you possible; otherwise lots of cycles would be wasted, and it would be much slower.
See it for yourself: Click on "fork", comment out the random tests (and some of the larger fixed tests), and run it; then comment out the two lines in question and run it again.
Cheers
if abc > n:
break
why is it so useful