????????
      +---------
QLPWY | GGYPQRUN
       -MUNHJ
        =====
         XQQMR
        -URJTP
         =====
         QQPULU
        -QHNYMY
         ======
           LPUPN
          -XLQPU
           =====
           ?????

base: 14
letters: GHJLMNPQRTUWXY
difficulty: medium