context: Chances are slight that Greg is a swan. It is probably not the case that Brian is a lion. It is almost certain that Mary went to the kitchen. It is certain that if either Greg is a swan, or Mary went to the kitchen, then Lily is a rhino. It is improbable that if Brian is a lion, or Mary went to the kitchen, then John took the apple. There is a very good chance that if either Mary went to the kitchen, or Brian is a lion, then Daniel left the football.
hypothesis: It is highly unlikely that mary went to the kitchen, and Daniel left the football.
valid_hypothesis: There is a better than even chance that mary went to the kitchen, and Daniel left the football.
invalid_hypothesis: It is highly unlikely that mary went to the kitchen, and Daniel left the football.
hypothesis_assertion: Mary went to the kitchen, and Daniel left the football.