if len(result) == 0:
            result.append({'district': None,
                           'sub_district': None, 'union': None})
        # when multiple district found
        if len(result) == 2 and sum(x != None for x in result[0].values())==1 and sum(x != None for x in result[1].values())==1:
            #print(result)
            if any(re.search(result[0]['district'].lower()+'\s*'+rd,' '+input_address+' ') for rd in self.road_suffix):
                result=[result[1]]
            if any(re.search(result[1]['district'].lower()+'\s*'+rd,' '+input_address+' ') for rd in self.road_suffix):
                result=[result[0]]
 
        if len(result) == 2 and sum(x != None for x in result[0].values())==1 and sum(x != None for x in result[1].values())==1:
            for item in self.DD:
                if item[1]==result[0]['district'] and item[0]==result[1]['district']:
                    result=[result[1]]
                    break
                if item[1]==result[1]['district'] and item[0]==result[0]['district']:
                    result=[result[0]]
                    break
 
 
        if len(result) > 1:
            flag = -1
            null_flag = False
            for i in result:
                #total matched comp count for each result(dsu)
                cnt = sum(x != None for x in i.values())
                if cnt == flag:
                    null_flag = True
                    break
                if cnt > flag:
                    item = i
                    flag = cnt
            if null_flag == False:
                result = []
                result.append(item)
 
        if len(result) > 1:
            result = []
            result.append({'district': None,
                           'sub_district': None, 'union': None})
        self.cleanAddress = input_address
        print(result)
        print(self.execute_time)
        return result