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Since 1990 chaos synchronization between two coupled systems has been a topic of great attention.After about ten years, synchronization was introduced into a network.Since then, synchronization inside a network, or "inner synchronization" for brevity, has become a very hot topic.Till now there have been a huge number of publications[1].Very recently, synchronization has been generalized to two coupled continuous-time networks[2].Such a synchronization is called "outer synchronization" for simplicity.