FYN
      +--------
QWYLF | EGMGNWQ
       -QWYLF
        =====
        LPGREW
       -MWMQQY
        ======
         QRHMEQ
        -QFFGGN
         ======
          TGYTW

base: 13
letters: EFGHLMNPQRTWY
difficulty: hard
missing: T