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main.php
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<?php

require_once ("lib.php");

$pair = \PhpPairs\Pairs\cons('first', 'second');

print_r(\PhpPairs\Pairs\car($pair));
print_r("\n");

print_r(\PhpPairs\Pairs\cdr($pair));
print_r("\n");

print_r($pair); // don't do it