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```
n = 9;
@a = (1, 2 ,3);
@b = (a, b, c);
```

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$a[0] = 1 $b[0] = a
$a[0] = 1 $b[1] = b
...
$a[0] = 1 $b[0] = a
$a[0] = 1 $b[1] = b
$a[1] = 2 $b[2] = c