[ [ $i, $j, $k ], [ 44, 55, 66, 22 ] ]
^ ^  ^   ^   ^    ^ ^   ^   ^   ^
| |  |   |   |    | |   |   |   |
| |  |   |   |    | |   |   |   + - $arr->[1][3]
| |  |   |   |    | |   |   + - $arr->[1][2]
| |  |   |   |    | |   + - $arr->[1][1]
| |  |   |   |    | + - $arr->[1][0]
| |  |   |   |    + - $arr->[1]
| |  |   |   + - $arr->[0][2]
| |  |   + - $arr->[0][1]
| |  + - $arr->[0][0]
| + - $arr->[0]
+ - $arr