context: It is improbable that Greg is a swan. It is impossible that Bernhard is white. It is probably the case that Mary went to the school.
hypothesis: It is highly likely that greg is a swan, and Bernhard is white.
valid_hypothesis: It is impossible that greg is a swan, and Bernhard is white.
invalid_hypothesis: It is highly likely that greg is a swan, and Bernhard is white.
hypothesis_assertion: Greg is a swan, and Bernhard is white.