????????
      +---------
FXPXJ | WPLQTRFR
       -FXPXJ
        =====
        PXMWFR
       -PURGFM
        ======
         XTUJGF
        -XUPREL
         ======
          NLWRWR
         -NFLWFE
          ======
          ??????

base: 14
letters: EFGJLMNPQRTUWX
difficulty: medium