public function dataProviderForCofactor() { return [[[[1, 4, 7], [3, 0, 5], [-1, 9, 11]], 0, 0, -45], [[[1, 4, 7], [3, 0, 5], [-1, 9, 11]], 0, 1, -38], [[[1, 4, 7], [3, 0, 5], [-1, 9, 11]], 1, 2, -13]]; }