?????????
      +----------
ZLYVU | WVLYWMHMP
       -WZWXL
        =====
         LUGHM
        -JVPTM
         =====
          LYZGH
         -JVPTM
          =====
           PYRXM
          -MMWNH
           =====
            MQXQP
           -MMWNH
            =====
            ?????

base: 16
letters: GHJLMNPQRTUVWXYZ
difficulty: medium