public function dataProviderForTwoSquareMatrices()
{
return [[[[1, 5], [4, 3]], [[5, 6], [2, 1]]], [[[3, 8, 5], [3, 6, 1], [9, 5, 8]], [[5, 3, 8], [6, 4, 5], [1, 8, 9]]], [[[-4, -2, 9], [3, 14, -6], [3, 9, 9]], [[8, 7, 8], [-5, 4, 1], [3, 5, 1]]], [[[4, 7, 7, 8], [3, 6, 4, 1], [-3, 6, 8, -3], [3, 2, 1, -54]], [[3, 2, 6, 7], [4, 3, -6, 2], [12, 14, 14, -6], [4, 6, 4, -42]]]];
}