- ini_tri.dbf  ( ini odds for trios )
- tri_odds.dbf ( input odds )


- ini_tri.prg  ( ini tri odds )
- sel_dtr.dbf  ( input the selection horse no. )

- do dtr       ( Generate the double dtri and calculate the final odds ) --- tri_t_05.prg

- dtr.dbf      ( result )
- 

+ dtr_comp.prg

  dtr01.dbf
  dtr02.dbf

  use dtr to generate and append to dtr01 02



  Single Banker

  1  2  2
     3  3
     4  4

  Multiple

  0  2  2
     3  3
     4  4


- Generate two trio in
  
  dt_tr1.dbf and dt_tr2.dbf ----> Generate DTR

- From there generate the 
  
-