context: It is probable that Bill is in the office. We believe that Emily is a cat. It is almost certain that Brian is gray.
hypothesis: It is certain that bill is in the office, or Brian is gray.
valid_hypothesis: It is certain that bill is in the office, or Brian is gray.
invalid_hypothesis: It is highly unlikely that bill is in the office, or Brian is gray.
hypothesis_assertion: Bill is in the office, or Brian is gray.