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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.
Indeed ;). However the test is passed anyway since it check if the difference between your result and the expected result is < 1. But to properly answer the question (which is always better) you should indeed import math and apply the floor function to the result.