context: It is certain that Jeff went to the kitchen. We believe that Brian is a rhino. Chances are slight that Lily is gray. It is highly unlikely that if either Jeff went to the kitchen, or Brian is a rhino, then Winona is a cat. There is little chance that if Lily is gray, and Jeff went to the kitchen, then Julius is a lion. It is unlikely that if Brian is a rhino, and Lily is gray, then Daniel got the milk.
hypothesis: It is improbable that either Brian is a rhino, or Daniel got the milk.
valid_hypothesis: We believe that either Brian is a rhino, or Daniel got the milk.
invalid_hypothesis: It is improbable that either Brian is a rhino, or Daniel got the milk.
hypothesis_assertion: Either Brian is a rhino, or Daniel got the milk.