multiple tablerate

Someone asked me how to do a multiple tablerate, and actually I found it on magento forum. I am gonna list the code that I modified here:

\app\code\core\Mage\Shipping\Model\Carrier\Tablerate.php to \app\code\core\Mage\Shipping\Model\Carrier\Tablerate3.php or Tablerate(n).php

That is screen shot if you just copy my code to your site that will show on your Magento Admin Panel:

Note: This is my modified version, please read comment. In your case, your file should be similar to \app\code\core\Mage\Shipping\Model\Carrier\Tablerate.php, but except you will add a number after tablerate for Tablerate(n).
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