WEE
      +--------
FJMWG | JGCCGPE
       -FJMWG
        =====
        WWGJQP
       -WQEPYF
        ======
         WFCGRE
        -WQEPYF
         ======
          FRMQG

base: 11
letters: CEFGJMPQRWY
difficulty: intermediate