+ dirac_gamma(varidx(mu, dim)) * dirac_gamma(varidx(mu, 4-dim, true))
* color_T(idx(x, 8), 1) * color_h(idx(x, 8), idx(y, 8), idx(2, 8))
* indexed(x, sy_anti(), idx(2*y+1, x), varidx(-mu, 5))
+ dirac_gamma(varidx(mu, dim)) * dirac_gamma(varidx(mu, 4-dim, true))
* color_T(idx(x, 8), 1) * color_h(idx(x, 8), idx(y, 8), idx(2, 8))
* indexed(x, sy_anti(), idx(2*y+1, x), varidx(-mu, 5))