????????
      ----------
UUCNY ) TMJJCUNN
       -UUCNY
        =====
         JUXNU
        -UUCNY
         =====
         MRJRYN
        -CTUFUX
         ======
          FCUXCN
         -GNTGJY
          ======
          ??????

base: 12
symbols: CFGJMNRTUWXY
difficulty: medium
missing: W