WWXT
      +---------
HEMET | NYEMNTXW
       -HEMET
        =====
         QYXXT
        -HEMET
         =====
         EQTPYX
        -ENPXGQ
         ======
          EYTWWW
         -MQYNEN
          ======
           EPPQT

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