context: It is probably the case that Brian is a swan. It is highly unlikely that John went to the kitchen. Chances are about even that Emily is a mouse. It is unlikely that if John went to the kitchen, or Emily is a mouse, then Jason is bored. It is certain that if Emily is a mouse, or John went to the kitchen, then Bernhard is gray. Chances are slight that if Emily is a mouse, and John went to the kitchen, then Daniel got the milk.
hypothesis: It is highly unlikely that either Daniel got the milk, or John went to the kitchen.
valid_hypothesis: It is highly unlikely that either Daniel got the milk, or John went to the kitchen.
invalid_hypothesis: There is a better than even chance that either Daniel got the milk, or John went to the kitchen.
hypothesis_assertion: Either Daniel got the milk, or John went to the kitchen.