context: We believe that Bill dropped the milk. It is improbable that Mary went to the hallway. It is probable that Greg is a frog. Chances are about even that if Greg is a frog, or Bill dropped the milk, then Bernhard is gray. It is highly unlikely that if either Mary went to the hallway, or Bill dropped the milk, then Brian is a rhino. Chances are about even that if Greg is a frog, or Mary went to the hallway, then Jeff moved to the office.
hypothesis: It is highly unlikely that mary went to the hallway, and Jeff moved to the office.
valid_hypothesis: It is highly unlikely that mary went to the hallway, and Jeff moved to the office.
invalid_hypothesis: It is probably the case that mary went to the hallway, and Jeff moved to the office.
hypothesis_assertion: Mary went to the hallway, and Jeff moved to the office.