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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.
It seems to me, or simple tests are contradictory.
Passing a 2 by 2 test is possible with an index (0,0) for the lower right corner and with an index (1,1) for the upper left corner.
Passing a 3 by 3 test is possible with an index (0,0) for the lower left corner and with an index (0,2) for the upper left corner.
Passing a 5 by 5 test is possible with an index (4,4) for the lower right corner and with an index (0,0) for the upper left corner.
Am i wrong somewhere?