context: It is probably the case that John went to the hallway. It is almost certain that Julius is a swan. There is almost no chance that Fred is in the kitchen. It is impossible that if John went to the hallway, and Fred is in the kitchen, then Greg is green. It is probably not the case that if either John went to the hallway, or Julius is a swan, then Brian is a rhino. It is improbable that if Julius is a swan, and John went to the hallway, then Mary left the apple.
hypothesis: It is impossible that julius is a swan, and Greg is green.
valid_hypothesis: It is impossible that julius is a swan, and Greg is green.
invalid_hypothesis: There is a better than even chance that julius is a swan, and Greg is green.
hypothesis_assertion: Julius is a swan, and Greg is green.