context: It is unlikely that Emily is a cat. It is unlikely that Gertrude is a mouse. There is little chance that John went to the garden. It is unlikely that if either John went to the garden, or Emily is a cat, then Mary left the football. It is probably not the case that if Emily is a cat, or John went to the garden, then Lily is white. Chances are about even that if John went to the garden, or Emily is a cat, then Brian is yellow.
hypothesis: It is highly likely that either Brian is yellow, or Mary left the football.
valid_hypothesis: It is improbable that either Brian is yellow, or Mary left the football.
invalid_hypothesis: It is highly likely that either Brian is yellow, or Mary left the football.
hypothesis_assertion: Either Brian is yellow, or Mary left the football.