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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.
The directions should be more clear. However if you look at the examples, it's asking for each word to be indexed starting at 0. It's do-able, but I was frustrated as well.
HORRIBLE YOU CANT SOLVE IT, DO NOT DO IT
You should move the "import math" to outside of the function. This imports math module each time the function is ran, which I believe slows it down.