context: It is unlikely that Fred went to the hallway. It is probably the case that Daniel got the apple. Chances are about even that Jeff moved to the office. It is highly unlikely that if either Daniel got the apple, or Fred went to the hallway, then Sandra left the football. It is likely that if either Daniel got the apple, or Jeff moved to the office, then Greg is yellow. There is a very good chance that if Fred went to the hallway, or Jeff moved to the office, then Brian is a lion.
hypothesis: It is almost certain that fred went to the hallway, or Greg is yellow.
valid_hypothesis: Chances are about even that fred went to the hallway, or Greg is yellow.
invalid_hypothesis: It is almost certain that fred went to the hallway, or Greg is yellow.
hypothesis_assertion: Fred went to the hallway, or Greg is yellow.