QNHG
      +---------
RQFGJ | GYUHJQUQ
       -QYMRN
        =====
        RXHEMQ
       - JYMNQ
        ======
          UMEXU
         -LFGQL
          =====
           HXNRQ
          -ERYHF
           =====
            YYLL

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