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http://ir-dl.com/software-section/applied/%D9%86%D8%B3%D8%AE%D9%87-%DB%8C-%D8%A7%D8%B5%D9%84%DB%8C-%D9%86%D8%B1%D9%85-%D8%A7%D9%81%D8%B2%D8%A7%D8%B1-%D9%85%D8%AD%D8%A8%D9%88%D8%A8-%D9%88-%D9%85%D8%B4%D9%87%D9%88%D8%B1-visual-basic/