context: It is highly unlikely that Lily is a lion. It is probable that John went to the bedroom. It is certain that Sandra dropped the apple. We doubt that if Sandra dropped the apple, or John went to the bedroom, then Bernhard is a lion. There is almost no chance that if Sandra dropped the apple, and John went to the bedroom, then Brian is a rhino. We doubt that if either Sandra dropped the apple, or John went to the bedroom, then Mary got the milk.
hypothesis: We believe that either Mary got the milk, or John went to the bedroom.
valid_hypothesis: We believe that either Mary got the milk, or John went to the bedroom.
invalid_hypothesis: There is little chance that either Mary got the milk, or John went to the bedroom.
hypothesis_assertion: Either Mary got the milk, or John went to the bedroom.