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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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Remember to use spoiler flag, even here.
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I don't know why, but for some reason I wasn't able to
import mathorfrom math import sqrt, so I just didpow(n, 0.5)