????????
      +---------
UUQYY | HUTWGQQN
       -UUQYY
        =====
        LFGTWQ
       - UUQYY
        ======
         GMGTPQ
        -QJHYNW
         ======
          MWMNHN
         -TUWFQN
          ======
          ??????

base: 13
letters: FGHJLMNPQTUWY
difficulty: medium