context: It is likely that Sandra took the football. It is probably the case that John left the apple. It is almost certain that Greg is yellow. It is highly likely that if either Greg is yellow, or John left the apple, then Jessica is a wolf. It is likely that if Greg is yellow, and Sandra took the football, then Brian is a swan. It is probably not the case that if Sandra took the football, and Greg is yellow, then Lily is gray.
hypothesis: Chances are about even that either Brian is a swan, or Greg is yellow.
valid_hypothesis: Chances are about even that either Brian is a swan, or Greg is yellow.
invalid_hypothesis: It is certain that either Brian is a swan, or Greg is yellow.
hypothesis_assertion: Either Brian is a swan, or Greg is yellow.