context: It is likely that Greg is green. There is a very good chance that Brian is a lion. It is highly likely that Julius is white.
hypothesis: It is almost certain that either Brian is a lion, or Greg is green.
valid_hypothesis: Chances are about even that either Brian is a lion, or Greg is green.
invalid_hypothesis: It is almost certain that either Brian is a lion, or Greg is green.
hypothesis_assertion: Either Brian is a lion, or Greg is green.