context: It is probable that John took the milk. Chances are about even that Julius is white. It is impossible that Sandra got the apple.
hypothesis: It is impossible that sandra got the apple, and John took the milk.
valid_hypothesis: It is impossible that sandra got the apple, and John took the milk.
invalid_hypothesis: It is almost certain that sandra got the apple, and John took the milk.
hypothesis_assertion: Sandra got the apple, and John took the milk.