Why does Squealer train the sheep to say “Four legs good, two legs better”? Do you think the sheep understand the difference between “bad” and “better”? How does this change serve the purposes of the pigs?

Squealer takes all the sheep out to an overgrown patch of land on the far side of the farm. Over the next week, he claims to be teaching them a song, and no one sees them. On the day the sheep return, Clover alerts the other animals to a disturbing fact: Squealer and the other pigs are walking two-footed, on their hind legs. The sheep break into a chorus of, “Four legs good, two legs better!” Benjamin accompanies Clover to the barn wall, where he deigns to read to her for the first time. In place of the Seven Commandments there is now a single maxim: “All animals are equal / But some animals are more equal than others” (133).