Assosiative Arrays Problem

Hi,

I have one associative array which I need to take the data from and build up another array.

Existing code:
Build up first array:

for r_get_clauses in c_get_clauses(p_request_id,p_prod_line_id) loop
   
for r_get_obj in c_get_obj(p_request_id) loop
     
  if (r_get_obj.object_no = r_get_clauses.object_no) OR (r_get_clauses.object_no is null) then
   array_row := array_row + 1;
         
  item_clause_table(array_row).item :=  trim(r_get_obj.rnum);
  item_clause_table(array_row).clause :=  trim(r_get_clauses.CLAUSE_ID);

   end if;
   end loop;
   end loop;

This results in the following table
Item  Clause
1      16
2      16
3      16
2      56
1     150

I need to take the data by looping through the first array and populate a second array whilst transforming the data to this:

Item                   Clause
Item 1 & 2 & 3    16
Item 2                 56
Item 1                 150

As you can see the code should check all item which matches a clause, and write them in a single row as shown above.

I have started on the second array, but got stuck with the NEXT.PRIOR methods.

This is what I have so far:
 --read item_clause_table
     FOR i IN item_clause_table.FIRST .. item_clause_table.LAST
    LOOP
   
        if (item_clause_table(i).clause = prev_clause) OR (prev_clause is null) then
        array_row_out := array_row_out + 1;
       
          if prev_clause is null then
            v_item_out := 'Item ' || item_clause_table(i).item;
            else
            v_item_out := v_item_out || ' & ' || item_clause_table(i).item;
          end if;
         
         if item_clause_table.NEXT(item_clause_table(i).clause) <> item_clause_table(i).clause then

         item_clause_table_out(array_row_new).item :=  trim(to_char((v_item_out)));
         item_clause_table_out(array_row_new).clause := prev_clause;
       
         end if;
         
        else

        array_row_new := array_row_new + 1;
        item_clause_table_out(array_row_new).item :=  trim(to_char((v_item_out)));
        item_clause_table_out(array_row_new).clause := item_clause_table(i).clause;
       
        end if;

Any help will be appreciated.