premise: Young men drink coffee and read books just outside some buildings on a sunny day; an older bearded man in a dark blue shirt glances at a younger man in a striped shirt, who has a red toy crab on the table next to him. hypothesis: The older bearded man is indeed Gandalf the Grey.
contradiction: Young men cannot be an older man.|contradiction: Just because an old man wears a dark blue shirt does not mean that he is Gandalf the Grey.|contradiction: The older bearded man cannot be Gandalf the Grey because he is indeed dead.