????????
      +---------
VPMYP | YZHQPMYT
       -PGYQG
        =====
        GXTJQM
       -GVZLHX
        ======
         UNGZLY
        -UGNWRU
         ======
          UYYWXT
         -UYPZNM
          ======
          ??????

base: 16
letters: GHJLMNPQRTUVWXYZ
difficulty: medium
hints: J = 0, T = 1, G = 2