context: It is certain that Brian is a rhino. It is probably the case that Sandra took the football. It is certain that Bernhard is a frog.
hypothesis: It is probably the case that sandra took the football, and Bernhard is a frog.
valid_hypothesis: It is probably the case that sandra took the football, and Bernhard is a frog.
invalid_hypothesis: It is impossible that sandra took the football, and Bernhard is a frog.
hypothesis_assertion: Sandra took the football, and Bernhard is a frog.