JJL
      +---------
LMGWW | FMJFLYXX
       -XWXMJY
        ======
         FYFXMX
        -XWXMJY
         ======
          GRYGRX
         -JQFQGR
          ======
           YLWGY

base: 11
letters: EFGJLMQRWXY
difficulty: intermediate
restrictions: no multiplication
missing: E