?????????
      +----------
NWFTE | MMQRLJPRJ
       -MXUUQE
        ======
         QFXJJP
        -ULTPUE
         ======
          QUPWPR
         -ULTPUE
          ======
           QNUURJ
          -QMLTXE
           ======
           ??????

base: 13
letters: EFJLMNPQRTUWX
difficulty: medium