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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.
My solution just passed whilst not taking into account litres less than 5...
https://www.codewars.com/kata/reviews/57b5f4c88a36ac1d46000fae/groups/5f675903e6d0d80001aaef17
That means you probably passed with incomplete / inaccurate solution. Do you remember inputs of a test which you failed before? It might be worth adding some extra tests.
but it's already there in the description
You mean, like this?