GQN
      +---------
LGHGX | GFQXWXQG
       - LGHGX
        ======
         NCNLFQ
        -NLGCLH
         ======
          HHWNWG
         -YXLMXW
          ======
           LGFCN

base: 11
letters: CFGHLMNQWXY
difficulty: intermediate
restrictions: no multiplication