context: It is certain that Greg is a swan. We believe that Bernhard is yellow. It is probably the case that Julius is a lion.
hypothesis: Chances are about even that julius is a lion, and Bernhard is yellow.
valid_hypothesis: Chances are about even that julius is a lion, and Bernhard is yellow.
invalid_hypothesis: It is highly unlikely that julius is a lion, and Bernhard is yellow.
hypothesis_assertion: Julius is a lion, and Bernhard is yellow.