?????????
      +----------
UTRXQ | PGXPFQWRY
       -PYMTPF
        ======
         FJWYYW
        -TTMJTW
         ======
          UJXQXR
         -FGGQUR
          ======
           NYWPXY
          -YFWNYG
           ======
           ??????

base: 13
letters: FGJMNPQRTUWXY
difficulty: intermediate