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Greater Paris is famous for its extensive metro and RER(express rail)system．By the end of 2006,there were 14 metro lines in Paris as illustrated in Figure 1,and 5 RER lines as illustrated in Figure 2．
Greater Paris is famous for its extensive metro and RER (express rail) system. By the end of 2006, there were 14 metro lines in Paris as illustrated in FIG. 1, and 5 RER lines as illustrated in FIG. 2.