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http://fmformation.net/article/What-is-the-Great-Martingale-Method.html?timestamp=bU3qp7c972cUekgu&rsc_t=y6XEAl31NFS3s9PG&wsx=hAfEL5SFL7BWWbzr&nex=ACP9ds8p4CwqclRI&dot=0.46285964200225016&utm=guang5