How to call function with varray arguments .

Hi,
I've got function like this:
CREATE OR REPLACE
TYPE VARR_VARCHAR AS VARRAY(256) OF NVARCHAR2(500)
CREATE OR REPLACE
TYPE E_VARR_VARCHAR AS VARRAY(256) OF nVARCHAR2(4096)
FUNCTION find_id(
      p_id            IN   VARCHAR2,
      p_special_columns     IN   varr_varchar,
      p_special_values      IN   e_varr_varchar,
      RETURN VARCHAR2;How can I construct call to that function (nvarchar datatype is a need) using only pl/sql and can I do that with pure sql like select f() from dual; ?
I'm on 9.2.0.8 .
Regards
GregG

select find_id (p_id,VARR_VARCHAR('1','2','3'),e_varr_varchar('1','2','3')) from dual;
--sty.                                                                                                                                                                                               

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