????????
      ----------
MWGJQ ) PWXPJJQJ
       -PPJWWQ
        ======
         GPJUYQ
        -GGMXXG
         ======
          XXYQWJ
         -XXGMMW
          ======
          ??????

base: 10
symbols: GJMPQRUWXY
missing: R
difficulty: medium
hints: U << G, G << R