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for my $count (0..4) {
    print("$count: ");
...
    elsif ($count < 2) { print "Unique\n"; } 
    else               { print "$count\n"; }
}

0: None
1: Unique
2: 2
3: 3
4: 4

my $substr = 'xxx';
for my $parent (
...
    elsif ($count < 2) { print "Unique\n"; } 
    else               { print "$count\n"; }
}

None
Unique