Therefore, some birds are not four-legged. No parrots are four-legged. Some birds are turkeys. 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.