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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.
These tests are checking whether the input list was modified. The kata requires that the original data remains intact and you create a new list.
Python tests are not functional. Some of the "correct" answers involve lists that have lower values at a greater index that some of the previous values.