Anchor: He laughed and thanked them.
Entailed: He thanked them after laughing.
Contradiction: With a serious face, he told them that they were welcome.
Contradiction: California will be gaining this program due to a recent ruling from Washington.
Contradiction: Outbound mail adds $456 million to institutional costs.
Contradiction: I never made any marriage proposal to Cynthia. 
Contradiction: People are engaged in a group activity.