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Phraya Sisunthonwohan (Noi Acharayangkun) was a native of Paet Rio. He was the author of many textbooks on Thai language for teaching purposes, such as Munlabot Banphakit, Wahanit Nikon, Akson Prayok, Sangyok Phithan, Waiphot Phichan, Phisan Karan. These were the most complete textbooks for Thai youth at that time.