context: It is probable that Julius is green. It is likely that Sandra dropped the milk. Chances are about even that Greg is a swan.
hypothesis: Chances are about even that either Greg is a swan, or Julius is green.
valid_hypothesis: Chances are about even that either Greg is a swan, or Julius is green.
invalid_hypothesis: It is impossible that either Greg is a swan, or Julius is green.
hypothesis_assertion: Either Greg is a swan, or Julius is green.