<?php
$a1 = [
0 => 2,
1 => 1,
2 => 8,
3 => 10,
4 => 11,
12 => 9,
];
$a2 = [
0 => 9,
1 => 8,
2 => 1,
3 => 11,
4 => 10,
5 => 2,
];
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