EWY
      +--------
TMQHU | JFHFYMT
       -HYUCF
        =====
        TFYFJM
       -TTEYMJ
        ======
         TMQQUT
        -TFYQCM
         ======
          TMCHJ

base: 11
letters: CEFHJMQTUWY
difficulty: medium
missing: W