附註:Publisher's no.: 04-20 DJ-21, 04-21 AP-28, 04-22 AS-27, 04-23 BK-24, 04-24 CP-20, 04-25 DB-19, 04-26 EA-12.
Primer Level (Preparatory) -- Level One (A or Gr. 1) -- Level Two (B or Gr. 1 1/2) -- Level Three (C or Gr. 2) -- Level Four (D or Gr. 2 1/2) -- Level Five (E or Gr. 3) -- Level Six (F or Gr. 4).
