Loading collection data...
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.
Test in Python says to return None, but test written to look for ''.
Correct, I should have bounded my compliment properly :)
This comment is hidden because it contains spoiler information about the solution
mind = 'blown'
I don't see how this code rejects a list that doesn't match the
nxn dimensional requirement.