????????
      +---------
JYYJX | FQUYQJUX
       -JYYJX
        =====
        YYLXLJ
       -YCJFQC
        ======
         YQQJJU
        -YCJFQC
         ======
          YUHYUX
         -YXLUCJ
          ======
          ??????

base: 9
letters: CFHJLQUXY
difficulty: intermediate