???????
      +--------
XYGHN | ZYLRHUH
       -XYGHN
        =====
        MQUTZU
       - YVJYY
        ======
         XXPTWH
        -MLRRVX
         ======
         ??????

base: 16
letters: GHJLMNPQRTUVWXYZ
difficulty: hard
hints: G << V