???????
      ---------
JWFXP ) XNNCXCF
       -JWFXP
        =====
        QLCFQC
       -QCGMFG
        ======
         FWQLWF
        -FCXCTG
         ======
         ??????

base: 12
symbols: CFGJLMNPQTWX
difficulty: medium