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http://www.rakluke.com/article/5/21/1393/10-%E0%B8%A7%E0%B8%B4%E0%B8%98%E0%B8%B5%E0%B8%9B%E0%B8%A3%E0%B8%B1%E0%B8%9A%E0%B8%9E%E0%B8%A4%E0%B8%95%E0%B8%B4%E0%B8%81%E0%B8%A3%E0%B8%A3%E0%B8%A1%E0%B9%80%E0%B8%94%E0%B9%87%E0%B8%81%E0%B8%94%E0%B8%B7%E0%B9%89%E0%B8%AD%E0%B9%80%E0%B8%94%E0%B9%87%E0%B8%81%E0%B8%8B%E0%B8%99http://www.vcharkarn.com/varticle