????????
      +---------
JGLLU | HWQHXGWW
       -YWWWP
        =====
        LZRNLG
       - YWWWP
        ======
         JJGVYW
        -JLVZZH
         ======
          LXVVMW
         -LRJRRH
          ======
          ??????

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