context: We doubt that Emily is a cat. It is probable that Bill went to the kitchen. Chances are about even that Brian is a lion.
hypothesis: It is impossible that bill went to the kitchen, or Emily is a cat.
valid_hypothesis: We believe that bill went to the kitchen, or Emily is a cat.
invalid_hypothesis: It is impossible that bill went to the kitchen, or Emily is a cat.
hypothesis_assertion: Bill went to the kitchen, or Emily is a cat.