name the office holder whose predecessor is e . m . sudarsana natchiappan and successor is e . m . sudarsana natchiappan ?
SELECT DISTINCT var_uri where brack_open var_uri dbp_predecessor dbr_E._M._Sudarsana_Natchiappan sep_dot var_uri dbp_successor dbr_E._M._Sudarsana_Natchiappan sep_dot var_uri a dbo_OfficeHolder brack_close