Therefore, some birds are not four-legged. B. All chickens are four-legged. Some birds are chickens. Therefore, some birds are not four-legged. No men are three-eyed.
Some humans are men.
Therefore, some humans are not three-eyed. No chickens are four-legged. Most birds are chickens. Therefore, some birds are not four-legged. E. No parrots are four-legged.