context: It is impossible that John took the apple. It is improbable that Mary got the milk. It is impossible that Bernhard is gray. There is little chance that if either Mary got the milk, or Bernhard is gray, then Greg is yellow. It is certain that if either Bernhard is gray, or John took the apple, then Lily is a swan. It is unlikely that if Mary got the milk, and John took the apple, then Daniel dropped the milk.
hypothesis: It is certain that greg is yellow, and Mary got the milk.
valid_hypothesis: There is almost no chance that greg is yellow, and Mary got the milk.
invalid_hypothesis: It is certain that greg is yellow, and Mary got the milk.
hypothesis_assertion: Greg is yellow, and Mary got the milk.