context: It is probable that Julius is a frog. Chances are about even that Greg is green. It is probably the case that Fred dropped the apple. It is certain that if Greg is green, or Julius is a frog, then Lily is a rhino. It is probably not the case that if Julius is a frog, and Greg is green, then John went to the bedroom. There is almost no chance that if Julius is a frog, or Fred dropped the apple, then Mary moved to the garden.
hypothesis: It is certain that greg is green, and Lily is a rhino.
valid_hypothesis: Chances are about even that greg is green, and Lily is a rhino.
invalid_hypothesis: It is certain that greg is green, and Lily is a rhino.
hypothesis_assertion: Greg is green, and Lily is a rhino.