context: We doubt that Brian is a rhino. It is probably the case that John left the apple. There is a very good chance that Mary went to the garden. There is a very good chance that if John left the apple, and Brian is a rhino, then Sandra grabbed the milk. There is almost no chance that if Mary went to the garden, and John left the apple, then Bernhard is green. We doubt that if either John left the apple, or Brian is a rhino, then Lily is white.
hypothesis: It is likely that either Mary went to the garden, or Brian is a rhino.
valid_hypothesis: It is likely that either Mary went to the garden, or Brian is a rhino.
invalid_hypothesis: It is unlikely that either Mary went to the garden, or Brian is a rhino.
hypothesis_assertion: Either Mary went to the garden, or Brian is a rhino.