Anchor:  Dave could clearly see that nothing was on the desk.
Entailed: It was obvious to Dave that there wasn't anything on the desk.
Contradiction: It was easy for Dave to see the piece of sky sitting on the desk.
Contradiction: Private schools are very patient and work patiently and well with problem children. 
Contradiction: There are many words that precede foot.
Contradiction: A man in uniform holds a flag while sitting atop a cow.
Contradiction: All program and policy assumptions have a start date of 2002.