context: We believe that Greg is a frog. It is unlikely that Fred went to the garden. Chances are about even that Mary is in the school. There is little chance that if either Mary is in the school, or Fred went to the garden, then Sandra took the apple. It is almost certain that if Fred went to the garden, and Greg is a frog, then Brian is a lion. It is probable that if Mary is in the school, or Greg is a frog, then Bernhard is a rhino.
hypothesis: There is little chance that bernhard is a rhino, and Fred went to the garden.
valid_hypothesis: There is little chance that bernhard is a rhino, and Fred went to the garden.
invalid_hypothesis: It is probably the case that bernhard is a rhino, and Fred went to the garden.
hypothesis_assertion: Bernhard is a rhino, and Fred went to the garden.