????????
      +---------
RLMGY | YPTVYQWM
       -RLMGY
        =====
        RTLXUQ
       -RTYTTZ
        ======
          TTZHW
         -YNNWQ
          =====
           HUJJM
          -VMLNJ
           =====
           ?????

base: 16
letters: GHJLMNPQRTUVWXYZ
difficulty: hard
hints: Q << 0