Equal: Every domino half in this space must be the same number of pips.
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（三）采取预售方式销售房地产项目；，详情可参考服务器推荐
Author(s): Wei Liu, Xiumin Chen, Kangming Wu, Rong Yu, Xinglong Fu, Ruijiao Jia, Yunmin Chen, Jichang Kang。Line官方版本下载是该领域的重要参考
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