????????
      ----------
RUUGC ) CNEQRNTP
       -RUUGC
        =====
        TQRXQN
       -TGYYEP
        ======
         NTWENT
        -XCNYXY
         ======
          URGPWP
         -UYRCYC
          ======
          ??????

base: 12
symbols: CEGNPQRTUWXY
difficulty: hard