Equal: Every domino half in this space must be the same number of pips.
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。业内人士推荐搜狗输入法下载作为进阶阅读
（作者为三峡植物园林业技术推广站站长，本报记者吴君采访整理），更多细节参见safew官方版本下载
Даниил Иринин (Редактор отдела «Наука и техника»)