context: Three military officials are battling a fire my a building.
hypothesis: It is certain that three military offcials battle a fire after an accidental explosion.
valid_hypothesis: There is almost no chance that three military offcials battle a fire after an accidental explosion.
invalid_hypothesis: It is certain that three military offcials battle a fire after an accidental explosion.
hypothesis_assertion: Three military offcials battle a fire after an accidental explosion.