context: Chances are slight that Greg is a rhino. It is likely that Mary dropped the milk. We doubt that John discarded the milk. It is probably the case that if John discarded the milk, or Mary dropped the milk, then Fred moved to the office. It is certain that if either Greg is a rhino, or Mary dropped the milk, then Bill is in the kitchen. We believe that if John discarded the milk, or Mary dropped the milk, then Bernhard is a swan.
hypothesis: It is almost certain that bill is in the kitchen, and Fred moved to the office.
valid_hypothesis: Chances are about even that bill is in the kitchen, and Fred moved to the office.
invalid_hypothesis: It is almost certain that bill is in the kitchen, and Fred moved to the office.
hypothesis_assertion: Bill is in the kitchen, and Fred moved to the office.