context: It is highly unlikely that Mary dropped the milk. It is probably the case that Bernhard is a rhino. Chances are slight that Julius is gray.
hypothesis: It is impossible that julius is gray, and Mary dropped the milk.
valid_hypothesis: It is impossible that julius is gray, and Mary dropped the milk.
invalid_hypothesis: It is likely that julius is gray, and Mary dropped the milk.
hypothesis_assertion: Julius is gray, and Mary dropped the milk.