LWP
      +---------
QUHHR | RWPQHRTW
       -RRJQJN
        ======
         RHUWWT
        -RNLWPG
         ======
           TUJNW
          -QUHHR
           =====
            GLGJ

base: 11
letters: GHJLNPQRTUW
difficulty: medium
restrictions: no multiplication