EYN
      +---------
WQPRQ | WJLTWTRE
       -QENQUG
        ======
         UGLGPR
        -UTYXPU
         ======
          YQLJTE
         -UELWNW
          ======
           QERUT

base: 13
letters: EGJLNPQRTUWXY
difficulty: intermediate
restrictions: no multiplication