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                 4)  12, 24, 30


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                 5)  9, 15, 21

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                 6)  12, 30, 42, 60

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                                                                ์
                                         ส ถ า บั น ส ง เ ส ริ ม ก า ร ส อ น วิ ท ย า ศ า ส ต ร แ ล ะ เ ท ค โนโ ล ยี   ( ส ส ว ท . )
                                               ่
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