????????
      ----------
RTUNM ) PYQUFMUU
       -PRFTN
        =====
         TUMQM
        -NYQQR
         =====
          JXWJU
         -UQPJY
          =====
          RJJXMU
         -RUXTUT
          ======
          ??????

base: 12
symbols: FJMNPQRTUWXY
difficulty: medium