A   B   C   D   E   F   G   H   I   J   K   L   M
     AA  BB  CC  DD  EE  FF  GG  HH  II  JJ  KK  LL  MM
     AA  BB  CC  DD  EE  FF  GG  HH  II  JJ  KK  LL  MM

     aa  bb  cc  dd  ee  ff  gg  hh  ii  jj  kk  ll  mm
     aa  bb  cc  dd  ee  ff  gg  hh  ii  jj  kk  ll  mm

    N   O   P   Q   R   S   T   U   V   W   X   Y   Z
     NN  OO  PP  QQ  RR  SS  TT  UU  VV  WW  XX  YY  ZZ
     NN  OO  PP  QQ  RR  SS  TT  UU  VV  WW  XX  YY  ZZ

     nn  oo  pp  qq  rr  ss  tt  uu  vv  ww  xx  yy  zz
     nn  oo  pp  qq  rr  ss  tt  uu  vv  ww  xx  yy  zz