$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