????????
      +---------
YYJNX | FULXLNWY
       -FLFHHF
        ======
         HNCYCW
        -HJCLFC
         ======
          NJFXLY
         -HCUXLJ
          ======
          ??????

base: 10
letters: CFHJLNUWXY
hints: X << H, F << W, N << F
difficulty: medium