VTHJ
      +---------
JYMTZ | TWQQMXUV
       -JYMTZ
        =====
        XHMYJX
       -XLUWLR
        ======
         NPXVXU
        -NJWWWR
         ======
          UJUZUV
         -UYNQJZ
          ======
           NQGPG

base: 16
letters: GHJLMNPQRTUVWXYZ
difficulty: medium
missing: G