context: It is probably not the case that Greg is a swan. It is probably not the case that John went to the garden. It is highly likely that Lily is white.
hypothesis: Chances are about even that john went to the garden, or Greg is a swan.
valid_hypothesis: Chances are about even that john went to the garden, or Greg is a swan.
invalid_hypothesis: It is impossible that john went to the garden, or Greg is a swan.
hypothesis_assertion: John went to the garden, or Greg is a swan.