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Xiao Feng and 18 Riders of YanYun arrived at Shaolin to search Azi, they are Khitan warriors of Liao empire, but how can a khitan warriors like them freely passed a Yanmen Pass (in which heavily guarded and had a strong fortress) and entering a central plain and beyond , before finally arrived at shaolin? he was not alone, but with 18 riders of Liao empire and their horses .
i think there is no explanation at all in the novel, so what do you think?