LHP
      +---------
LJHXH | GWLELPJL
       -QGEJHG
        ======
         JWXUEJ
        -JFQEQX
         ======
          PUHQHL
         -UHGRLL
          ======
           ELHGR

base: 13
letters: EFGHJLMPQRUWX
difficulty: hard
restrictions: no multiplication
missing: M