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my @arr1 = (1, 2, 3, 4, 5);
my @arr2 = (4, 5, 6, 7, 8);
...
#234567890#234567890#234567890
@h{map{@$_}@_}=1;keys%h
}

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```
@h{map@$_,@_}=1;keys%h
```