LYH
      +--------
GYNUU | XQGFGGR
       -XPTGJ
        =====
         RLLGG
        -UXQPY
         =====
         MRUTNR
        -MFWWPJ
         ======
           TYHR

base: 15
letters: FGHJLMNPQRTUWXY
difficulty: medium
missing: H