????????
      +---------
LQYTQ | TGHHFGNT
       -LQYTQ
        =====
        YXUFWG
       -XLRRPW
        ======
         HUFHWN
        -MTRNXT
         ======
          MFMQUT
         -MXYTPN
          ======
          ??????

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