context: There is little chance that Bernhard is a swan. It is probable that Fred went to the kitchen. There is a very good chance that Julius is white. Chances are about even that if Julius is white, and Bernhard is a swan, then John discarded the apple. It is unlikely that if Fred went to the kitchen, or Bernhard is a swan, then Greg is a frog. It is highly unlikely that if Julius is white, and Fred went to the kitchen, then Brian is yellow.
hypothesis: It is impossible that either John discarded the apple, or Fred went to the kitchen.
valid_hypothesis: It is probably the case that either John discarded the apple, or Fred went to the kitchen.
invalid_hypothesis: It is impossible that either John discarded the apple, or Fred went to the kitchen.
hypothesis_assertion: Either John discarded the apple, or Fred went to the kitchen.