QNN
       +---------
MNQMUN | UUFQGNCC
        -GQUGMQ
         ======
         MMGCQGC
        -MFQQCCM
         =======
          MMUQUEC
         -MFQQCCM
          =======
           MMCUCE

base: 8
letters: CEFGMNQU
difficulty: medium