context: It is likely that Greg is gray. Chances are about even that Brian is a frog. Chances are slight that Julius is a lion. There is little chance that if either Julius is a lion, or Brian is a frog, then Bernhard is a swan. We believe that if Greg is gray, or Julius is a lion, then John took the apple. It is highly likely that if either Brian is a frog, or Julius is a lion, then Mary moved to the office.
hypothesis: It is highly likely that greg is gray, and Brian is a frog.
valid_hypothesis: It is probably not the case that greg is gray, and Brian is a frog.
invalid_hypothesis: It is highly likely that greg is gray, and Brian is a frog.
hypothesis_assertion: Greg is gray, and Brian is a frog.