Anchor: Two friends prepare to go mountain biking.
Entailed: Two friends are preparing.
Contradiction: Two friends are preparing to go fishing.
Contradiction: By that time, none of our senior executives and management evalutors will be eligible to retire yet.
Contradiction: Four are needed for making sure the rival explanations are ruled out.
Contradiction: Both boys are wearing green shirts
Contradiction: Those who tried to get away found it was not much better.