HMTT
      +---------
MEHTH | YJHXCUXH
       -MEHTH
        =====
        CJEJUU
       -CGMJMM
        ======
         XXETFX
        -XLGEHT
         ======
          XGFMJH
         -XLGEHT
          ======
           GUTTM

base: 12
letters: CEFGHJLMTUXY
difficulty: medium
restrictions: no multiplication