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my @array1 = (1,2,3,4,5);
my @array2 = (4,5,6,7,8);
...
print "Union:        @union\n";
print "Intersection: @intersection\n";
print "Difference:   @difference\n";

Union:        1 2 3 4 5 6 7 8
Intersection: 4 5
Difference:   1 2 3 6 7 8