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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.
Modifying the input breaks the random tests.
The reference solution is in Preloaded and hence can be imported by the user. It should go to the test fixture.
Duplicate of e.g. https://www.codewars.com/kata/5741df13077bdf57af00109c
There should be exaples with rectangular grids in description and sample/fixed tests.