context: We believe that Mary picked up the milk. It is improbable that Greg is a rhino. We believe that Sandra took the football. It is unlikely that if Mary picked up the milk, or Greg is a rhino, then Julius is a frog. It is highly unlikely that if Mary picked up the milk, or Greg is a rhino, then Brian is a swan. There is a very good chance that if either Mary picked up the milk, or Sandra took the football, then Gertrude is a mouse.
hypothesis: It is highly likely that gertrude is a mouse, or Sandra took the football.
valid_hypothesis: It is highly likely that gertrude is a mouse, or Sandra took the football.
invalid_hypothesis: It is highly unlikely that gertrude is a mouse, or Sandra took the football.
hypothesis_assertion: Gertrude is a mouse, or Sandra took the football.