context: It is unlikely that Fred went to the hallway. Chances are slight that Daniel grabbed the apple. Chances are about even that Brian is a frog. It is probably the case that if either Fred went to the hallway, or Daniel grabbed the apple, then Bill dropped the milk. It is likely that if Brian is a frog, or Fred went to the hallway, then Mary moved to the office. It is probably not the case that if Daniel grabbed the apple, and Fred went to the hallway, then Lily is a rhino.
hypothesis: There is a better than even chance that fred went to the hallway, or Brian is a frog.
valid_hypothesis: There is a better than even chance that fred went to the hallway, or Brian is a frog.
invalid_hypothesis: There is almost no chance that fred went to the hallway, or Brian is a frog.
hypothesis_assertion: Fred went to the hallway, or Brian is a frog.