suggestions on how to do this

[bwaha]

Hi bgs

Many thanks. This generates the correct coefficients. I am studying
your implementation now. I've  not used a dictionary of dictionaries
before so there's a bit of a learning curve going on right now. However
I can see that b[k] holds the relevant info (coefficients and powers)
so I can easily modify it to collect terms with like powers. As for
speed, its not a concern. Thanks again.

bwaha Chris