O: Ychl           

\:  eܱΪ󪫩ʧ
                         
m: 
   1 UԦ\          YU   ->  ϼh
   2 uC             Y_ֳt]w  ->  ϼh

BJ: 
  1  -- }Ҧϼh   (Wϥ, OO all_lay)

  2  -- ܭnܤϼh,Lϼh   (Wϥ, OO show_lay)
        a1. (ih) ,uܪݼh,Lh
        a2. Enter (L), ȥuhW,Lh
        ****u@h]|****

  3 W[ -- bϼhW椤ܭnl[ܤϼh  (Wϥ, OO add_lay)

  4  -- ܭnl[ϼh   (Wϥ, OO off_lay)
        a1. (ih) ,ܪݼh,Lh
        a2. Enter (L), ȥuhW,Lh
        ****u@h]|****

  5 @-- ϼh,קK~R   (Wϥ, OO lock_lay)

  6  -- Ѷ}ϼh   (Wϥ, OO unlock_lay)

  7 عϼh   (Wϥ, OO new_lay)
  
  8 ܴ: (ϼh,u,C)    (Wϥ, OO chg_lay)
     a1. ,ih,HEnter -> EnterIsϼh/<ϼh>:
     a2. ϼh---ϼhοJhW(~sbhW)
     a3. u
       a.  -- uܧϼh , u.
       b. Hh -- wHh , uHh(Bylayer).
       c. u -- uu(Continuous).
       d. ߽u -- u߽u(Center).
       e. u -- uu(Hidden).
       f. Qu -- uQu(Phantom).

     a4. C -- 1 ~ 256
