???????
      +--------
MHHHX | MCTMHCL
       -MHHHX
        =====
         NCEMC
        -MHHHX
         =====
         HMXETL
        -HHUGET
         ======
         ??????

base: 11
letters: CEGHLMNTUXY
difficulty: medium
hints: L << Y
missing: Y