????????
      +---------
FUAYW | WANUNAWW
       -WUGGAY
        ======
         YFGGWW
        -YXYFGA
         ======
          WAFYXW
         -WAFXXA
          ======
          ??????

base: 10
letters: AFGMNRUWXY
missing: R M
hints: M << Y
difficulty: medium