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1.http://www.viteetam.com





               2.http://www.parungtip.com/ar



               ticles/42231352




               3.https://dictionary.sanook.com/sear

               ch/dict-th-th-royal-institute





              4.http://www.thaigoodview.com/li


              brary/contest2552/type2/science0



              4/28/P_Unt
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