QWQ
      +--------
YQPHU | HHYLGMQ
       -FWURW
        =====
        GGTTJM
       -GRXQTW
        ======
          LFQXQ
         -FWURW
          =====
          YRHNP

base: 15
letters: FGHJLMNPQRTUWXY
difficulty: hard
missing: N