NRTEN
      +----------
QYNEX | QGXGGRWCY
       -QYNEX
        =====
         WNCQRW
        -CTCNYW
         ======
          YRCQRC
         -XGXCWT
          ======
           NYNYQY
          - QYNEX
           ======
            CTXYN

base: 10
letters: CEGNQRTWXY
difficulty: intermediate
restrictions: no multiplication