context: Chances are about even that Sandra got the apple. It is probably the case that Brian is white. There is a better than even chance that Bill dropped the milk. There is a better than even chance that if Bill dropped the milk, and Sandra got the apple, then Fred went to the hallway. There is little chance that if either Brian is white, or Bill dropped the milk, then Jessica is a mouse. We doubt that if Brian is white, and Bill dropped the milk, then Mary is in the garden.
hypothesis: It is improbable that mary is in the garden, or Bill dropped the milk.
valid_hypothesis: There is a better than even chance that mary is in the garden, or Bill dropped the milk.
invalid_hypothesis: It is improbable that mary is in the garden, or Bill dropped the milk.
hypothesis_assertion: Mary is in the garden, or Bill dropped the milk.