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diff --git a/challenge-004/gustavo-chaves/perl5/ch-2b.pl b/challenge-004/gustavo-chaves/perl5/ch-2b.pl
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+++ b/challenge-004/gustavo-chaves/perl5/ch-2b.pl
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+#!/usr/bin/env perl
+
+# You are given a file containing a list of words (case insensitive 1 word per
+# line) and a list of letters. Print each word from the file than can be made
+# using only letters from the list. You can use each letter only once (though
+# there can be duplicates and you can use each of them once), you don’t have to
+# use all the letters. (Disclaimer: The challenge was proposed by Scimon
+# Proctor)
+
+use 5.026;
+use strict;
+use autodie;
+use warnings;
+use List::Util 'all';
+
+my $letters = shift or die "usage: $0 <letters> [<wordsfile>...]\n";
+
+# Construct a hash mapping each letter to its count number
+my %letters;
+++$letters{$_} foreach split //, lc $letters;
+
+say foreach grep {
+    chomp;
+    my %letters = %letters;
+    --$letters{$_} foreach split //, lc $_;
+    all {$_ >= 0} values %letters;
+} <>;