????????
      +---------
YPWYC | PFFJWFYM
       -WFCWL
        =====
        YQWWFF
       - RCGQQ
        ======
          MGFFY
         -LEWMC
          =====
           MPLMM
          -LEWMC
           =====
           ?????

base: 12
letters: CEFGJLMPQRWY
difficulty: medium