context: We believe that Brian is a lion. It is unlikely that John moved to the office. We doubt that Mary went to the hallway. There is a better than even chance that if either John moved to the office, or Brian is a lion, then Bill is in the school. There is almost no chance that if John moved to the office, and Brian is a lion, then Bernhard is white. Chances are slight that if Brian is a lion, and Mary went to the hallway, then Julius is gray.
hypothesis: It is probable that brian is a lion, and Bill is in the school.
valid_hypothesis: It is probably not the case that brian is a lion, and Bill is in the school.
invalid_hypothesis: It is probable that brian is a lion, and Bill is in the school.
hypothesis_assertion: Brian is a lion, and Bill is in the school.