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#!/usr/bin/env perl
use strict;
...
print "inter: ", pp(\%inter), "\n";
print "sd1: ", pp(\%sd1), "\n";
print "sd2: ", pp(\%sd2), "\n";

Use of uninitialized value $array2[2] in hash slice at /home/lanx/B/PL
+/PM/set2.pl line 12.
Use of uninitialized value $array2[2] in delete at /home/lanx/B/PL/PM/
+set2.pl line 16.
array1: [1, 2, ""]
...
inter: { "" => undef, 2 => 2 }
sd1: { 1 => 1 }
sd2: { 3 => 3 }