context: We believe that Julius is green. There is almost no chance that Greg is a swan. It is improbable that Sandra got the apple.
hypothesis: It is likely that greg is a swan, and Sandra got the apple.
valid_hypothesis: It is impossible that greg is a swan, and Sandra got the apple.
invalid_hypothesis: It is likely that greg is a swan, and Sandra got the apple.
hypothesis_assertion: Greg is a swan, and Sandra got the apple.