[GiNaC-list] dirac_spinor?

Hi, I started looking at GiNaC only recenty, so forgive me if my question is too naive. I'm wondering if it is possible to define Dirac spinors in the context of Clifford objects, such that they can appear in chains of dirac_gammas. The only property I need at the moment is that dirac_spinor and dirac_gamma do not commute, such that for example dirac_gamma(j)*dirac_gamma(j.togglevariance)*dirac_spinor(p1)*dirac_gamma(i)*dirac_gamma(i.togglevariance)*dirac_spinor(p2)*dirac_gamma(j) will get simplified to 16 dirac_spinor(p1)*dirac_spinor(p2)*dirac_gamma(j) Cheers, Vladyslav