context: A group of young men are dumping soil onto the ground of their backyard.
hypothesis: It is certain that the young men are working to level an area of the yard to put in a new basketball court.
valid_hypothesis: It is impossible that the young men are working to level an area of the yard to put in a new basketball court.
invalid_hypothesis: It is certain that the young men are working to level an area of the yard to put in a new basketball court.
hypothesis_assertion: The young men are working to level an area of the yard to put in a new basketball court.