XLG
      +--------
GZWNH | PZJNJNQ
       -MLRYY
        =====
        TGYHRN
       -TLMLHN
        ======
         XWTLVQ
        -XRQGZY
         ======
          LGNRX

base: 16
letters: GHJLMNPQRTUVWXYZ
difficulty: hard
hints: G << Q, Y << W, T = 1
missing: U