CJJF
      +---------
CCTQC | XHWCJCTN
       -XTCNX
        =====
         CQFQC
        -CCTQC
         =====
          XCWWT
         -CCTQC
          =====
          JHNNNN
         -JFWNFT
          ======
           JCHXF

base: 9
letters: CFHJNQTWX
difficulty: intermediate
restrictions: no multiplication