context: It is likely that Emily is a mouse. It is probably not the case that Sandra dropped the milk. There is little chance that Bernhard is a swan. It is certain that if either Emily is a mouse, or Bernhard is a swan, then Lily is a frog. We doubt that if either Emily is a mouse, or Sandra dropped the milk, then Brian is a lion. Chances are about even that if Sandra dropped the milk, or Emily is a mouse, then Bill moved to the garden.
hypothesis: It is highly likely that bill moved to the garden, and Brian is a lion.
valid_hypothesis: It is highly unlikely that bill moved to the garden, and Brian is a lion.
invalid_hypothesis: It is highly likely that bill moved to the garden, and Brian is a lion.
hypothesis_assertion: Bill moved to the garden, and Brian is a lion.