Because in the area adjacent to the province Lao There is a steep mountain terrain, no customs, so businessmen in Phitsanulok Province The trade with Laos through other provinces such as Chiang Rai Province, Nong KhaiI must bring the information about the trade value from other provinces to collect for the report แล้วส่ง head at the end of, but sometimes There are some provinces that sends information to slow Send data over time to arrange to sendSo in the end I busy
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