Anchor: Most of the organizations said that they had to work to overcome the challenge of maintaining their memberships' enthusiasm and participation so that members would use the communication mechanisms, maintain confidentiality, and continue to share relevant information.
Entailed: Communication while maintaining confidentiality is very important for any organization.
Contradiction: The challenge of participation among employees is not actually a challenge in itself. 
Contradiction: The group is riding bicycles.
Contradiction: Men are eating at the fair.
Contradiction: a dog barks to a beat
Contradiction: The U.S. would not tolerate negotiations with Hussein.