context: Chances are about even that Bernhard is a frog. It is highly likely that Mary put down the apple. We doubt that John went to the office. It is certain that if Mary put down the apple, or John went to the office, then Bill dropped the milk. It is certain that if John went to the office, and Bernhard is a frog, then Jason is hungry. It is almost certain that if either Bernhard is a frog, or John went to the office, then Greg is a lion.
hypothesis: It is impossible that bernhard is a frog, and Mary put down the apple.
valid_hypothesis: Chances are about even that bernhard is a frog, and Mary put down the apple.
invalid_hypothesis: It is impossible that bernhard is a frog, and Mary put down the apple.
hypothesis_assertion: Bernhard is a frog, and Mary put down the apple.