[GiNaC-list] Geometric Algebra

I am trying to use the clifford algebra classes to do geometric algebra. To do this I must do a grade decomposition of multivectors. Is there a way to use clifford to list to do this other than the case of a simple vector (not a multivector). In the call: lst clifford_to_lst(const ex & e, const ex & c, bool algebraic = true); what should "c" be to get a complete multivector expansion in terms of the basis blades of the algebra. Letting "c = clifford_unit()" only expands simple vectors. After doing a grade decompostion I need to calculate the inner and outer products of homogenous (pure) grade multivector.