????????
      ----------
TQPQM ) QUTRTFYF
       -RMRYW
        =====
         QQUMF
        -RMRYW
         =====
         FURGTY
        - XUMFT
         ======
          TYRUFF
         -TFYFGU
          ======
          ??????

base: 12
symbols: CFGMPQRTUWXY
difficulty: hard
missing: C