????????
      +---------
UFHQX | EMXUAQME
       -EAXHM
        =====
         EQAXQ
        -EAXHM
         =====
          XXHAM
         -XCEMH
          =====
           UECQE
          -UFHQX
           =====
           ?????

base: 9
letters: ACEFHMQUX
difficulty: medium