context: A fireman is on a ladder leaning on a charred and smoking house.
hypothesis: There is a better than even chance that a fireman on a ladder is trying to find survivors
valid_hypothesis: There is a better than even chance that a fireman on a ladder is trying to find survivors
invalid_hypothesis: There is little chance that a fireman on a ladder is trying to find survivors
hypothesis_assertion: a fireman on a ladder is trying to find survivors