????????
      +---------
EGCRR | GFTRGCFF
       -EGCRR
        =====
        JCFLTC
       -JFJECC
        ======
         RTEFLF
        -RJRLHG
         ======
          RUEUWF
         -RJRLHG
          ======
          ??????

base: 11
letters: CEFGHJLRTUW
difficulty: medium