context: Chances are about even that Lily is a rhino. It is improbable that John went to the garden. It is highly unlikely that Fred is in the office. Chances are slight that if either Lily is a rhino, or Fred is in the office, then Antoine is hungry. It is unlikely that if either Lily is a rhino, or John went to the garden, then Sandra got the apple. Chances are slight that if John went to the garden, and Fred is in the office, then Greg is a lion.
hypothesis: We believe that either Greg is a lion, or Sandra got the apple.
valid_hypothesis: There is little chance that either Greg is a lion, or Sandra got the apple.
invalid_hypothesis: We believe that either Greg is a lion, or Sandra got the apple.
hypothesis_assertion: Either Greg is a lion, or Sandra got the apple.