????????
      ----------
PNXUX ) NLRGRPLX
       -NPNWX
        =====
         GXYQP
        -PNXUX
         =====
          TCTWL
         -WGXGC
          =====
           TNQLX
          -WGXGC
           =====
           ?????

base: 12
symbols: CGLNPQRTUWXY
difficulty: hard