context: Chances are slight that Brian is green. There is little chance that Julius is a lion. Chances are slight that Mary took the milk. It is probably the case that if either Brian is green, or Julius is a lion, then Jason is bored. There is a better than even chance that if Brian is green, and Mary took the milk, then John left the apple. It is probably not the case that if either Julius is a lion, or Mary took the milk, then Bill went to the kitchen.
hypothesis: It is highly likely that either Bill went to the kitchen, or John left the apple.
valid_hypothesis: It is highly unlikely that either Bill went to the kitchen, or John left the apple.
invalid_hypothesis: It is highly likely that either Bill went to the kitchen, or John left the apple.
hypothesis_assertion: Either Bill went to the kitchen, or John left the apple.