context: We believe that Julius is a swan. It is probably the case that Greg is gray. Chances are slight that Lily is a rhino. Chances are about even that if Lily is a rhino, and Julius is a swan, then Fred is in the bedroom. It is probably not the case that if Julius is a swan, and Lily is a rhino, then Sandra got the football. There is a better than even chance that if Lily is a rhino, and Greg is gray, then Jeff went to the garden.
hypothesis: We believe that jeff went to the garden, or Julius is a swan.
valid_hypothesis: We believe that jeff went to the garden, or Julius is a swan.
invalid_hypothesis: Chances are slight that jeff went to the garden, or Julius is a swan.
hypothesis_assertion: Jeff went to the garden, or Julius is a swan.