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use strict;
use warnings;
...
print join(', ', @intersect)."\n";
print join(', ', @union)    ."\n";
print join(', ', @diff)     ."\n";

11, 1, 3, 7, 9, 5
6, 11, 3, 7, 9, 12, 2, 8, 1, 4, 10, 5
6, 12, 2, 8, 4, 10