????????
      ----------
YXNQY ) UYXRCRWN
       -NPUXN
        =====
         XRQQR
        -YXNQY
         =====
         WTCGNW
        -WTGFGY
         ======
           PXQCN
          -FYWRR
           =====
           ?????

base: 12
symbols: CFGNPQRTUWXY
difficulty: hard