IV.D197 — Quark winding classes

The six quarks are assigned to three winding classes on T^2 with shape ratio iota_tau: Class (1,0) for Generation 1 (u, d) with eigenvalue beta = 1, Class (0,1) for Generation 2 (c, s) with eigenvalue beta = iota_tau^(-1), and Class (1,1) for Generation 3 (t, b) with eigenvalue beta = iota_tau^(-2).