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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.
Same with JS
Yes, especially confusing considering in the example 'coffee' > 'eecoff' results in 2, but in the tests it expects 4 (going the opposite direction). I honestly feel like the description is asking us to go forward but the tests actually want us to go backward.