select distinct wr_parent from g4_write_debate where ( ca_name = '1-20' or ca_name LIKE '1-20-%' ) and (wr_num between '-3570' and '96430') and ( wr_id != '152606' and wr_id != '152605' and wr_id != '152604' and wr_id != '152603' and wr_id != '152601' and wr_id != '152600' and wr_id != '152599' and wr_id != '152598' and wr_id != '151361' and wr_id != '148815' and wr_id != '138015' and wr_id != '137916' and wr_id != '137882' and wr_id != '137811' and wr_id != '137767' and wr_id != '137765' and wr_id != '137763' and wr_id != '136457' and wr_id != '136218' and wr_id != '136205' and wr_id != '135346' and wr_id != '135301' and wr_id != '8' and wr_10 = 'usher' ) order by wr_num, wr_reply limit 0, 15