YJE
      +---------
QYYXM | QJQYJYMQ
       -QCYHUE
        ======
         EYJUNM
        -EHYQCY
         ======
          EJJHQQ
         -UNYQHU
          ======
           NJMEN

base: 11
letters: CEHJMNQRUXY
difficulty: medium
restrictions: multiply only to find X
missing: R