????????
      ----------
TTWWC ) YFXRRYQT
       -TTWWC
        =====
        UQHTTY
       -RYXRRT
        ======
         XJJJUQ
        -XXXFFP
         ======
          XQTWRT
         - TTWWC
          ======
          ??????

base: 12
symbols: CFHJPQRTUWXY
difficulty: medium