context: It is unlikely that Greg is a swan. It is impossible that Mary went to the office. It is impossible that Sandra got the football. It is probably the case that if Greg is a swan, or Mary went to the office, then Julius is a lion. It is almost certain that if either Sandra got the football, or Greg is a swan, then Lily is yellow. It is probably not the case that if Greg is a swan, and Sandra got the football, then Brian is green.
hypothesis: It is improbable that greg is a swan, and Julius is a lion.
valid_hypothesis: It is improbable that greg is a swan, and Julius is a lion.
invalid_hypothesis: It is probably the case that greg is a swan, and Julius is a lion.
hypothesis_assertion: Greg is a swan, and Julius is a lion.