LGG
      +---------
WWNGC | LEEWWPGM
       -JHUHPC
        ======
         PGLJPG
        -PJWLEC
         ======
          PEFEGM
         -PJWLEC
          ======
           NLLUM

base: 12
letters: CEFGHJLMNPUW
difficulty: medium
restrictions: no multiplication