Anchor: Researchers can choose relatively freely which instance to study on any one of several bases, depending on the questions to be examined.
Entailed: Researchers can pick which they want to study.
Contradiction: Researchers canno pick which they want to study.
Contradiction: When the newcomer finished, he ate an ice-cream.
Contradiction: A young boy is on the beach digging up the sand
Contradiction: Do you watch CNN every day?
Contradiction: I will not go.