context: It is certain that Greg is green. There is almost no chance that John went to the garden. It is highly likely that Gertrude is a wolf. Chances are about even that if John went to the garden, or Greg is green, then Brian is white. It is probably not the case that if John went to the garden, or Greg is green, then Bill dropped the milk. Chances are about even that if Greg is green, or John went to the garden, then Julius is a swan.
hypothesis: Chances are about even that brian is white, and Gertrude is a wolf.
valid_hypothesis: Chances are about even that brian is white, and Gertrude is a wolf.
invalid_hypothesis: It is certain that brian is white, and Gertrude is a wolf.
hypothesis_assertion: Brian is white, and Gertrude is a wolf.