Yes, obviously I should have been more careful transferring Mathematica
formuals into Excel. I though that changing the Mma output into "Input Form"
would have been safe enough - obviously not. Otherwise one must enter the
formulas by hand - not a fun task.

I nice trick I've discovered is to make the cell-reference substitutions in
Mathematica (e.g. a - G3, b - G4...). This avoids doing it by hand as well.