????????
      +---------
TRFYQ | FHRNTGNE
       -TRFYQ
        =====
         PENPG
        -NPPYF
         =====
         GWRPWN
        -GXHNXY
         ======
          TETGEE
         -THXHQR
          ======
          ??????

base: 13
letters: EFGHLNPQRTWXY
difficulty: medium
missing: L