context: It is likely that Greg is a lion. It is almost certain that Julius is a swan. It is certain that Sandra left the football. It is unlikely that if Sandra left the football, and Julius is a swan, then Brian is a frog. Chances are slight that if Greg is a lion, or Sandra left the football, then Emily is a cat. There is almost no chance that if Greg is a lion, and Julius is a swan, then Mary went to the bedroom.
hypothesis: It is likely that either Greg is a lion, or Emily is a cat.
valid_hypothesis: It is likely that either Greg is a lion, or Emily is a cat.
invalid_hypothesis: Chances are slight that either Greg is a lion, or Emily is a cat.
hypothesis_assertion: Either Greg is a lion, or Emily is a cat.