????????
      ----------
GNYPT ) WJLYPWYW
       -PRXGF
        =====
        GJTLWW
       -GUJXJP
        ======
          FQJGY
         -PRXGF
          =====
          MTLWQW
         -MGQLPQ
          ======
          ??????

base: 15
symbols: FGHJLMNPQRTUWXY
difficulty: hard
missing: H