Anchor: He stared at the useless hilt in his hand.
Entailed: He had no use for the hilt in his hand that he was staring at. 
Contradiction: He could find many uses for the hilt that he was holding.
Contradiction: The people are on the streets.
Contradiction: There are children in a group.
Contradiction: There was no other way to get the necessary rocks.
Contradiction: A man is working in a laboratory.