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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.
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I think this Kata needs clearer instructions. I believe what you're asking for is to remove the most common number in all of the arrays from each array. It could easily be misinterpreted to mean, 'remove the most common number in each array from that array."
Stuck at 54. Nice work.
Had the same problem. Anyone find a solution?