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package Carpet;
use base qw(Class::InsideOut);  # base class that does the work
...
};

# note lack of DESTROY method - all done automagically

use Carpet;
use YAML;
...
$o->display;
$o2->display;
print "difference = \$", abs($o->price - $o2->price), "\n";

10 x 10 (100 sq m) @ $1 = $100
15 x 10 (150 sq m) @ $0.85 = $127.5
difference = $27.5

#! /usr/bin/perl

...


1;

#! /usr/bin/perl

...
};

1;

package Class::InsideOut::YAML;
use YAML::Node;
...
our @EXPORT = qw(yaml_load yaml_dump);

1;