????????
      +---------
RRJGF | RECFFYFL
       -RRJGF
        =====
         LUFGY
        -UYFMC
         =====
          YEECF
         -UYFMC
          =====
          RRFXML
         -RGURCU
          ======
          ??????

base: 11
letters: CEFGJLMRUXY
difficulty: intermediate