What changes on animal farm does napoleon announce to the animals?

Napoleon, who represents the founders of the Soviet Union, keeps altering the revolutionary direction until he brings it around to a tyranny identical to that of the human farmers. The two most notorious changes involve the slogans. He changes "Four legs good; two legs bad" to "Four legs good; two legs better" and "All animals are equal" to "All animals are equal, but some animals are more equal than others. "