context: It is impossible that Brian is a frog. It is highly unlikely that Fred went to the garden. It is almost certain that Julius is yellow. Chances are about even that if Brian is a frog, and Julius is yellow, then Mary left the apple. It is almost certain that if Julius is yellow, or Fred went to the garden, then Greg is white. It is certain that if Brian is a frog, and Julius is yellow, then Bernhard is gray.
hypothesis: Chances are about even that greg is white, and Fred went to the garden.
valid_hypothesis: It is highly unlikely that greg is white, and Fred went to the garden.
invalid_hypothesis: Chances are about even that greg is white, and Fred went to the garden.
hypothesis_assertion: Greg is white, and Fred went to the garden.