MXCN
      +---------
RYQXM | XJXYJCQP
       -RYQXM
        =====
        WPJXEC
       -WWNYNX
        ======
         MCCJPQ
        - NCRPC
         ======
          WEQJPP
         -WXPWYN
          ======
           CMQNQ

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