Help on returning a collection as Ref cursor

Hello Everyone.
I have a table

create table test1
(
  col1 number,
  col2 number
)

and the values are

insert into test1 values (1,1);
insert into test1 values (2,2);
insert into test1 values (3,3);
insert into test1 values (4,4);


I have to write a new function to do the following.
  1. It will delete all record where col1 >2
  2. send the table of record back as refe cusor to the calling program.

I know the below code is wrong but I would like to know how to do it?

create or replace function test ( aa_rec out SYS_REFCURSOR)
is
      type aa is table of test1%ROWTYPE;
      aa_rec aa;