context: It is highly unlikely that Brian is a frog. It is unlikely that Bill went to the kitchen. We believe that Lily is a rhino. It is almost certain that if Bill went to the kitchen, and Brian is a frog, then Mary got the football. We believe that if Lily is a rhino, or Brian is a frog, then Jessica is a cat. It is probable that if Bill went to the kitchen, and Lily is a rhino, then John took the apple.
hypothesis: It is highly unlikely that either Mary got the football, or Brian is a frog.
valid_hypothesis: It is highly unlikely that either Mary got the football, or Brian is a frog.
invalid_hypothesis: Chances are about even that either Mary got the football, or Brian is a frog.
hypothesis_assertion: Either Mary got the football, or Brian is a frog.