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Question

i am using auto serial number in crystal report.but my problem how can ignore the serial number if come data is duplicate.
for ex:
             EMP NAME
        1  DR.M.M. SAHU
        2  DR.M.M.SAHU
        3 DR J.PANDA
        4.DR S.NANDA
        5.DR.S.NANDA
        6.Mrs B.SINGHA
 I want to result
 
           EMP NAME
     1 DR.M.M.SAHU
        DR.M.M.SAHU
     2.DR.J.PANDA
     3.DR.S.NANDA
     4.DR.S.NANDA
        DR.S.NANDA
     5.Mrs B.SINGHA

so please help me which formula or method  use in this problem.