LUVV
      +---------
GVYYT | ZUQJLMUV
       -MQWHV
        =====
        WNZXZM
       -WGMLHZ
        ======
         LLZPXU
        -LHNTWL
         ======
          LGYQLV
         -LHNTWL
          ======
           GWMWU

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