????????
      ----------
NYXGX ) GHWNLLUJ
       -WHQWJ
        =====
        NRMGUL
       -UHRTPL
        ======
         NRGPRU
        -UHRTPL
         ======
          NXPQGJ
         -NPHRYQ
          ======
          ??????

base: 14
symbols: GHJLMNPQRTUWXY
difficulty: medium