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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.
I added an idea with uppercase and lowercase letters. Thanks!
Thanks for this comment! I will add the information to the description
Re-raised as an issue
It seems not any language has random test cases, which imho is bad practice. I could add them to the Ruby and Python versions, provided the authors are ok with it.
I'm not sure it is. I had a preoblem with the random test cases. Ichanged my program to take into account different sized lists, and it works...