????????
      +---------
PLWNN | HLFLYLGF
       -PLWNN
        =====
         XWUXL
        -LULXE
         =====
         PFNTPG
        -PHHHXG
         ======
          PFEHTF
         -PHHHXG
          ======
          ??????

base: 13
letters: EFGHJLNPTUWXY
difficulty: hard
missing: J