select distinct wr_parent from g4_write_qna where ca_name='토익' and (wr_num between '-31501' and '68499') and ( wr_id != '179537' and wr_id != '170836' and wr_id != '167901' and wr_id != '164917' and wr_id != '160637' and wr_id != '159336' and wr_id != '158263' and wr_id != '157753' and wr_id != '157439' and wr_id != '157131' and wr_id != '156781' and wr_id != '156243' and wr_id != '155100' and wr_id != '154405' and wr_id != '154012' and wr_id != '153833' and wr_id != '153762' and wr_id != '153659' and wr_id != '153658' and wr_id != '153657' and wr_id != '153624' and wr_id != '153555' and wr_id != '153511' and wr_id != '153510' and wr_id != '153334' and wr_id != '152346' and wr_id != '150954' and wr_id != '150591' and wr_id != '150568' and wr_id != '150186' and wr_id != '149913' and wr_id != '149814' and wr_id != '149674' and wr_id != '149460' and wr_id != '146380' and wr_id != '142351' and wr_id != '142282' and wr_id != '142278' and wr_id != '142277' and wr_id != '128751' and wr_id != '128749' ) order by wr_datetime desc limit 0, 15