context: Chances are slight that Bernhard is a swan. We doubt that Lily is white. There is almost no chance that Greg is yellow.
hypothesis: It is probably the case that greg is yellow, and Lily is white.
valid_hypothesis: It is impossible that greg is yellow, and Lily is white.
invalid_hypothesis: It is probably the case that greg is yellow, and Lily is white.
hypothesis_assertion: Greg is yellow, and Lily is white.