context: There is a very good chance that Fred went to the garden. Chances are slight that Brian is a lion. Chances are about even that Greg is a swan. There is a better than even chance that if Greg is a swan, or Brian is a lion, then Mary left the apple. It is probably not the case that if either Fred went to the garden, or Greg is a swan, then Julius is a frog. It is likely that if Brian is a lion, and Greg is a swan, then John got the milk.
hypothesis: There is a very good chance that brian is a lion, or Fred went to the garden.
valid_hypothesis: There is a very good chance that brian is a lion, or Fred went to the garden.
invalid_hypothesis: It is impossible that brian is a lion, or Fred went to the garden.
hypothesis_assertion: Brian is a lion, or Fred went to the garden.