context: It is probable that John went to the garden. It is unlikely that Brian is a rhino. There is almost no chance that Mary is in the park. It is likely that if John went to the garden, and Mary is in the park, then Sandra took the milk. We believe that if either John went to the garden, or Mary is in the park, then Greg is a frog. There is little chance that if Mary is in the park, or John went to the garden, then Lily is green.
hypothesis: Chances are about even that sandra took the milk, or Greg is a frog.
valid_hypothesis: Chances are about even that sandra took the milk, or Greg is a frog.
invalid_hypothesis: There is almost no chance that sandra took the milk, or Greg is a frog.
hypothesis_assertion: Sandra took the milk, or Greg is a frog.