HPJ
      +---------
QQNJH | HFMQMRPH
       -MQLLJR
        ======
         PJMLNP
        -FQRNRW
         ======
          JRPFHH
         -LQMFMQ
          ======
           RGNNR

base: 11
letters: FGHJLMNPQRW
difficulty: intermediate
restrictions: no multiplication