public function dataProviderForMultiplication() { return [[[1, 2, 3], [2, 3, 1], [2, 7, 13, 11, 3]], [[1, 2, 3, 4, 4], [2, 3, 1], [2, 7, 13, 19, 23, 16, 4]], [[1, -8, 12, 3], [1, -8, 12, 3], [1, -16, 88, -186, 96, 72, 9]]]; }