context: It is probable that Julius is a rhino. It is highly likely that Mary went to the kitchen. There is a very good chance that Brian is a swan. Chances are about even that if Brian is a swan, or Julius is a rhino, then Sandra got the football. It is unlikely that if Julius is a rhino, or Mary went to the kitchen, then Fred discarded the milk. It is impossible that if Mary went to the kitchen, or Julius is a rhino, then Greg is a frog.
hypothesis: It is probably the case that greg is a frog, and Fred discarded the milk.
valid_hypothesis: It is impossible that greg is a frog, and Fred discarded the milk.
invalid_hypothesis: It is probably the case that greg is a frog, and Fred discarded the milk.
hypothesis_assertion: Greg is a frog, and Fred discarded the milk.