$arr1 [0][0] = 00
$arr1 [0][1] = 01
$arr1 [1][0] = 10
$arr1 [1][1] = 11

$arr2 [0][0] = 00
$arr2 [0][1] = 01
$arr2 [1][0] = 10
$arr2 [1][1] = 11