perldoc perlmod 
http://perltricks.com/article/obscure-perl-trick--single-quote-separators/

##</code><code>##

2,4d1
< use strict;
< use warnings;
< use v5.20;    # oh yeah
7d3
< 
22c18,20
< 
---
> use strict;
> use warnings;
> use v5.20;    # oh yeah