context: It is highly likely that Greg is a swan. Chances are slight that Lily is a frog. It is probable that Brian is a lion. We believe that if Greg is a swan, or Brian is a lion, then Daniel is in the garden. It is probably not the case that if either Greg is a swan, or Brian is a lion, then Mary went to the hallway. It is unlikely that if Greg is a swan, and Lily is a frog, then Jessica is a mouse.
hypothesis: It is improbable that lily is a frog, and Greg is a swan.
valid_hypothesis: It is improbable that lily is a frog, and Greg is a swan.
invalid_hypothesis: There is a better than even chance that lily is a frog, and Greg is a swan.
hypothesis_assertion: Lily is a frog, and Greg is a swan.