Anchor: He meant that he didn't know about it, Dave gathered.
Entailed: Dave assumed he meant he had not known about it. 
Contradiction: Dave gathered that he meant he had known about it. 
Contradiction: Cheney is the head of GAO.
Contradiction: A brown dog is fetching something in its mouth on a field
Contradiction: i've never really taken an interest in the Dallas Cowboys
Contradiction: A skier goes down the mountain.