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#!/usr/bin/env perl -l

...

my @out = map { $_, $merge{$_} } sort { $a <=> $b } keys %merge;
print "@out";

1 20 2 0 2 1 3 0 3 0 3 1 7 0 8 2 9 1 9 2 10 3
1 20 2 1 3 1 7 0 8 2 9 3 10 3