????????
      ----------
EMXWH ) HXJMJXHH
       -HMCCXW
        ======
         WECCHH
        -WYWECX
         ======
          HXEWYH
         -HXEYYX
          ======
          ??????

base: 10
symbols: CEHJMNQWXY
missing: N Q
hints: Q << W
difficulty: medium