????????
      +---------
UQLFM | WTMMGLHU
       -UQLFM
        =====
         QNUQL
        -GJQTH
         =====
         XRLTFH
        -XTFPNL
         ======
           FNTTU
          -GJQTH
           =====
           ?????

base: 14
letters: FGHJLMNPQRTUWX
difficulty: medium