context: We believe that Bernhard is white. It is impossible that Sandra grabbed the apple. We believe that Julius is a frog. It is improbable that if Sandra grabbed the apple, and Bernhard is white, then Greg is a swan. Chances are about even that if Bernhard is white, and Sandra grabbed the apple, then Bill moved to the garden. It is improbable that if Bernhard is white, or Sandra grabbed the apple, then Mary went to the office.
hypothesis: It is improbable that mary went to the office, or Julius is a frog.
valid_hypothesis: We believe that mary went to the office, or Julius is a frog.
invalid_hypothesis: It is improbable that mary went to the office, or Julius is a frog.
hypothesis_assertion: Mary went to the office, or Julius is a frog.