context: It is impossible that Julius is a rhino. It is highly likely that Bill went to the garden. It is certain that Brian is a swan.
hypothesis: It is certain that bill went to the garden, or Brian is a swan.
valid_hypothesis: It is certain that bill went to the garden, or Brian is a swan.
invalid_hypothesis: We doubt that bill went to the garden, or Brian is a swan.
hypothesis_assertion: Bill went to the garden, or Brian is a swan.