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diff --git a/challenge-255/jo-37/perl/ch-2.pl b/challenge-255/jo-37/perl/ch-2.pl
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+++ b/challenge-255/jo-37/perl/ch-2.pl
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+#!/usr/bin/perl -s
+
+use v5.24;
+use Test2::V0;
+use List::UtilsBy 'max_by';
+
+our ($tests, $examples);
+
+run_tests() if $tests || $examples;	# does not return
+
+die <<EOS unless @ARGV > 1;
+usage: $0 [-examples] [-tests] [P W...]
+
+-examples
+    run the examples from the challenge
+ 
+-tests
+    run some tests
+
+P
+    a paragraph
+
+W...
+    list of banned words
+
+EOS
+
+
+### Input and Output
+
+say mfw(@ARGV);
+
+
+### Implementation
+
+sub mfw  {
+    my $p = shift;
+    my %count;
+    $count{$_}++ for split /\W+/, $p;
+    delete @count{@_}; 
+    max_by {$count{$_}} keys %count;
+}
+
+
+### Examples and tests
+
+sub run_tests {
+    SKIP: {
+        skip "examples" unless $examples;
+
+        is mfw('Joe hit a ball, the hit ball flew far after it was hit.',
+            'hit'), 'ball', 'example 1';
+        is mfw('Perl and Raku belong to the same family. Perl is the most popular language in the weekly challenge.',
+            'the'), 'Perl', 'example 2';
+    }
+
+    SKIP: {
+        skip "tests" unless $tests;
+
+        is mfw('one two three four five two three four five three four five four five five', 'two', 'four', 'five'), 'three', 'more banned words';
+	}
+
+    done_testing;
+    exit;
+}