#!/usr/bin/perl
use strict;
use warnings;

my (%hash, %dup_hash);
# Minor tweak to read from DATA rather than a file
while (my $line = <DATA>) {
    chomp($line);
    my ($enu, $deu) = split /\t/, $line;
    
    $hash{$enu} = $deu;

    # Keep a list of all duplicate values
    push @{$dup_hash{$deu}}, $enu;
}

for my $key (keys %hash) {
print "$key\n";
}
for my $value (values %hash) {
print "$value\n";
}

print "\nDuplicate definitions:\n";
for my $deu (keys %dup_hash) {
    if (scalar @{$dup_hash{$deu}} > 1) {
        for my $en (@{$dup_hash{$deu}}) {
            print "$deu => $en\n";
        }
        print "\n";
    }
}


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