????????
      +---------
NQYFY | QNPNQPPG
       -NQYFY
        =====
        YGWRXP
       -YXCRWJ
        ======
         YJWXYP
        -JQQWPG
         ======
          NNNFRG
         -NYRRPF
          ======
          ??????

base: 11
letters: CFGJNPQRWXY
difficulty: medium