How many passes are there in the Great Wall?
Jiayuguan, Shanhaiguan, Juyongguan, Yumenguan, Jingxingguan, Niangziguan, Yanmenguan, Piantouguan, Pingxingguan, Gubeikou, xifengkou, Yulin Sai, Huangyaguan, Waqiaoguan, Hushan Great Wall, crow stork pass, Niuzhuang City, fenshuiguan, Ningyuan City, Yangguan, Pingdingbao City, Ningyuan City. Zhangjiakou, Mashikou, Yangfangbaoguan, Shuikouguan, Zijingguan, Xuanhua City, Santunying, Sandaoguan, damao mountain, Yiyuankou, Jielingkou, Chongyukou, Xuliukou, Lengkouguan, Baiyangyuguan, Qingshan Pass, tiemenguan, Panjiakou, Longjingguan, Hongshankou, Shangguan, Changyukou and Langwogou. Hefangkou, Lianhuachiguan, Huanghua Chengguan, Jiaokou, Jiukonglou, Sihai Yekou, Juyansai Old Town, Gill Sai, Gaoque Sai, Datong City, Shahukou, Weilubaokou, Jinsuokou, Huangzeguan, Huangyuguan, Beiloukou, Ning Wuguan, Liminbaokou, Shengshengkou, Zhenhongbaokou, Pingyuan Fort. Refuse to be a wall fort, refuse to be a door fort, Fuma Fort, Broken Road Fort, Security Fort, Luning Fort, Broken Tiger Fort, Residual Tiger Fort, Ma Bao Fort, Marble Fort, Shaojia Fort, Dahe Fort, Defeated Tiger Fort, Ying 'en Fort, Blocked Tiger Fort, General Huibao, Yajiao Mountain, Laoying Fort, Hongmenkou Fort and Tiger Fort.