context: It is probably the case that John left the football. It is highly likely that Mary got the football. It is certain that Brian is a frog. There is a very good chance that if Mary got the football, and John left the football, then Bernhard is white. It is unlikely that if John left the football, and Brian is a frog, then Greg is yellow. Chances are slight that if either Mary got the football, or Brian is a frog, then Bill is in the school.
hypothesis: It is almost certain that greg is yellow, and Mary got the football.
valid_hypothesis: It is improbable that greg is yellow, and Mary got the football.
invalid_hypothesis: It is almost certain that greg is yellow, and Mary got the football.
hypothesis_assertion: Greg is yellow, and Mary got the football.