context: It is likely that Brian is white. We believe that John left the apple. Chances are about even that Greg is a frog. It is certain that if either John left the apple, or Greg is a frog, then Winona is a wolf. It is highly likely that if Greg is a frog, or Brian is white, then Mary is in the cinema. We believe that if Brian is white, or John left the apple, then Julius is a lion.
hypothesis: There is a very good chance that brian is white, or Greg is a frog.
valid_hypothesis: There is a very good chance that brian is white, or Greg is a frog.
invalid_hypothesis: There is little chance that brian is white, or Greg is a frog.
hypothesis_assertion: Brian is white, or Greg is a frog.