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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.
This solution is Bonito (Beautiful)
same as
i-- > 1This comment is hidden because it contains spoiler information about the solution
True !
I did not know why my Attempt was failing.
I assumed that there should be at least 2 elements in sub-arrays.
As a beginner, this is frustating
Please update description and mention that "Sub-arrays can hold only 1 element"