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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.
You are right, sorry for the arrogance, I am a rookie, so I guess it was rookie mistake XD
Thank you for the quick answer. Sorry for the spoiler, first time I ask a question here. My problem is that - if my understanding is correct - the input should be 2 lists. The random test I posted is (I think) an input, but it does not have two lists. It has 127 of this symbol "[" and 336 of "]". I tried to check it it with other methods as well, all resulted that that input is not a list of lists. It seems to me just a very long string. So that's why I have issues with the test.
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