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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.
Not a kata suggestion, 63 Codewarriors have passed this one
No going to lie, this took me a little over an hour. Kept getting stuck.
Good for you :)
I also stumbled over the 4 kyu, but especially because it is mentioned being easier than the kata "A Simple Music Encoder" - which is 5 kyu.
"A Simple Music Encoder": https://www.codewars.com/kata/58db9545facc51e3db00000a
Because my algorithm is very poor.