context: Chances are slight that Emily is a sheep. We doubt that John went to the kitchen. We doubt that Brian is a lion. It is highly unlikely that if either John went to the kitchen, or Brian is a lion, then Sandra left the milk. Chances are slight that if John went to the kitchen, or Emily is a sheep, then Bernhard is yellow. There is a better than even chance that if either Brian is a lion, or Emily is a sheep, then Mary discarded the apple.
hypothesis: It is almost certain that brian is a lion, and John went to the kitchen.
valid_hypothesis: It is highly unlikely that brian is a lion, and John went to the kitchen.
invalid_hypothesis: It is almost certain that brian is a lion, and John went to the kitchen.
hypothesis_assertion: Brian is a lion, and John went to the kitchen.