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research.dusit.ac.thresearch.dusit.ac.th/menu/abstra/abstract/full/social/valawan/ch2.pdf · nuuvqn-nlffl nUULV11îLJî nuufiîît-lîtn nUUîQSñåQî nUUînm-lîQîn nuunnnu nuuQfflE-l
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