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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.
Maybe someone should search through all the katas and reduce the sudoku validators to one... I just copied my solution for NxN sudoku here...
This comment is hidden because it contains spoiler information about the solution
for an even shorter solution: sum should work over a generator expression ;-)
I do not think that this is sufficient, since 'aabbc' and 'abccc' both have length 5 and {'a', 'b', 'c'}