context: It is almost certain that John dropped the milk. It is highly unlikely that Julie is in the bedroom. It is highly likely that Jessica is a cat. It is improbable that if John dropped the milk, or Julie is in the bedroom, then Mary went to the office. Chances are slight that if Jessica is a cat, and Julie is in the bedroom, then Brian is a lion. It is unlikely that if Jessica is a cat, or John dropped the milk, then Greg is yellow.
hypothesis: We believe that either Greg is yellow, or John dropped the milk.
valid_hypothesis: We believe that either Greg is yellow, or John dropped the milk.
invalid_hypothesis: There is little chance that either Greg is yellow, or John dropped the milk.
hypothesis_assertion: Either Greg is yellow, or John dropped the milk.