XHUW
      ----------
 WUWW ) XHNTAYHA
       -YWEWH
        =====
         HUTXY
        -EWYWX
         =====
          UUXWH
         -HWTWY
          =====
           WYANA
          -UWAWT
           =====
            YWNW

base: 10
symbols: AEFHNTUWXY
difficulty: intermediate
missing: F