context: It is almost certain that Fred went to the cinema. It is likely that Greg is green. There is a better than even chance that Julius is a swan. It is probably the case that if Fred went to the cinema, or Greg is green, then John left the milk. It is probable that if either Greg is green, or Fred went to the cinema, then Bernhard is white. We doubt that if Julius is a swan, and Greg is green, then Brian is a lion.
hypothesis: Chances are slight that brian is a lion, or Fred went to the cinema.
valid_hypothesis: It is almost certain that brian is a lion, or Fred went to the cinema.
invalid_hypothesis: Chances are slight that brian is a lion, or Fred went to the cinema.
hypothesis_assertion: Brian is a lion, or Fred went to the cinema.