????????
      +---------
GPHMN | YUFPUFPN
       -GPHMN
        =====
        FUMXLF
       -FGMUJN
        ======
          PMEYP
         -EPTHX
          =====
          TEMXEN
         -TYLFJW
          ======
          ??????

base: 14
letters: EFGHJLMNPTUWXY
difficulty: hard