context: Chances are slight that Brian is a swan. It is probable that Mary left the milk. We doubt that Julius is a swan.
hypothesis: Chances are slight that julius is a swan, and Mary left the milk.
valid_hypothesis: Chances are slight that julius is a swan, and Mary left the milk.
invalid_hypothesis: It is probably the case that julius is a swan, and Mary left the milk.
hypothesis_assertion: Julius is a swan, and Mary left the milk.