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You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near '-40 , 20' at line 1
select uid,id,writer,contents,email,homepage,wdate,indent,subject,count,userfile,bbs_level,bbs_ip,st,bbs_d_id from ins_bbs3 where homepage='6' order by id DESC limit -40 , 20