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+#!/usr/bin/perl
+
+# ponysaylist
+# Prints a list of ponies in columns
+#
+# Licensed under WTFPL
+# See COPYING for details
+
+# Author: Mattias Andrée, maandree@kth.se
+# spider-mario
+
+
+use strict;
+use warnings;
+use utf8;
+
+my %hash;
+
+{
+ local @ARGV = @ARGV;
+ while ((my ($source, $target), @ARGV) = @ARGV) {
+ unless ($source eq $target) {
+ push @{$hash{$target}}, $source;
+ }
+ }
+}
+
+while ((my ($source, $target), @ARGV) = @ARGV) {
+ if ($source eq $target) {
+ my @list = @{$hash{$source} // []};
+ print $source;
+ print ' (', join(' ', @list), ')' if @list;
+ print "\n";
+ }
+}