context: It is highly likely that Sandra left the football. It is unlikely that Bernhard is a rhino. It is probable that Mary dropped the milk.
hypothesis: We doubt that sandra left the football, and Bernhard is a rhino.
valid_hypothesis: We doubt that sandra left the football, and Bernhard is a rhino.
invalid_hypothesis: There is a very good chance that sandra left the football, and Bernhard is a rhino.
hypothesis_assertion: Sandra left the football, and Bernhard is a rhino.