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diff --git a/challenge-005/gustavo-chaves/perl5/ch-2b.pl b/challenge-005/gustavo-chaves/perl5/ch-2b.pl
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+++ b/challenge-005/gustavo-chaves/perl5/ch-2b.pl
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+#!/usr/bin/env perl
+
+# Write a program to find the sequence of characters that has the most anagrams.
+
+use 5.026;
+use strict;
+use autodie;
+use warnings;
+
+my %anagrams;
+my $max = 0;
+
+# Read list of words and classify them by anagrams
+while (<>) {
+    chomp;
+    my $count = ++$anagrams{join('', sort split //, lc $_)};
+    $max = $count if $count > $max;
+}
+
+# Print all sequences of letters with most anagrams
+while (my ($key, $words) = each %anagrams) {
+    say $key if $words == $max;
+}