Operating instructions for type Inhertiance

I am trying to create a subtype of the type like this:

create or replace type bank_object as an object
(bank_code, number (7),)
name varchar2 (50).
City varchar2 (50).
(2) tank of the State.
member function return varchar2 to_string) not final;
/

create or replace type bank_officers_obj under bank_object
(President, varchar2 (40))
Secretary varchar2 (40),
Treasurer varchar2 (40),
members function to_string return varchar2);
/

create or replace type body bank_officers_obj under bank_object
members function to_string return varchar2 is
v_result varchar2 (250);
Start
If self.president is not null then
v_result: = initcap (self.president);
end if;
If self.secretary is not null then
v_result: = ', '. initcap (self. Secretary);
end if;
If self.treasurer is not null then
v_result: = ', '. initcap (self. (Treasurer);
end if;

return of "Agents of" | Self.Name | 'from ' | Self.City | ', ' || Self.State | "include" | v_result;
end;
end;
/

I added no definitive after bank_object, but I get this error:

PLS-00103: encountered the symbol "INFERIOR to" when expected an of
What follows:
not pragma final cannot be instantiated order dominant static member
card constructor
The symbol 'pragma has been inserted before 'UNDER' to continue.

Anyone know what is happening? 
SQL> create or replace type bank_object
as
   object (bank_code number (7),
           name varchar2 (50),
           city varchar2 (50),
           state char (2),
           member function to_string
              return varchar2)
   not final;
/
Type created.

SQL> create or replace type bank_officers_obj
   under bank_object
   (president varchar2 (40),
    secretary varchar2 (40),
    treasurer varchar2 (40),
    overriding member function to_string
      return varchar2);
/
Type created.

SQL> create or replace type body bank_officers_obj
as
   overriding member function to_string
      return varchar2
   is
      v_result   varchar2 (250);
   begin
      if self.president is not null
      then
         v_result := initcap (self.president);
      end if;

      if self.secretary is not null
      then
         v_result := ', ' || initcap (self.secretary);
      end if;

      if self.treasurer is not null
      then
         v_result := ', ' || initcap (self.treasurer);
      end if;

      return    'Officers of '
             || self.name
             || ' of '
             || self.city
             || ', '
             || self.state
             || ' include '
             || v_result;
   end to_string;
end;
/
Type body created.

Tags: Database

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