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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 fails random tests with dan_1. But I checked everything manually.
136490 dan_1
expected 93 to deeply equal 92
247321 dan_1
expected 194 to deeply equal 193
etc..
There are also 21 katas kyu1 on Codewars. It should be noted that in the decision to consider the number of kata as unlimited.