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Mobile ad hoc networks are based on the assumption that all participants of the network cooperate and forward packets towards destinations. Unfortunately, there are no mechanisms to enforce cooperation. Thus, altruism and trust are two of the most important characteristics in mobile ad hoc networks. However what happens if there are selfish or even malicious nodes? Those nodes do not forward all packets to the next station. If the fraction of misleading nodes becomes too big, the throughput decreases significantly. This paper presents CineMA, a group based approach to improve the cooperation in mobile ad hoc networks.