User-agent: *
Disallow: /1a.php
Disallow: /1b.php
Disallow: /1c.php
Disallow: /1d.php
Disallow: /2a.php
Disallow: /2b.php
Disallow: /2c.php
Disallow: /2d.php
Disallow: /3a.php
Disallow: /3b.php
Disallow: /3c.php
Disallow: /3d.php