Let B be the set of builders in the village, and let C be the set of mechanics in the village. Every large house in the village has electricity. Every large house in the village has a water supply. For example, let A be the set of electricians in a village, let B be the set of builders in the village, and let C be the set of mechanics in the village. Then we cannot conclude anything about the builders and mechanics in the village.
All ghosts are difficult to see.
All ghosts are hungry. Every day in July this year it rained. Every day in July this year it was hot. Non-empty Intersection of a Subset Suppose A . The meaning of A .