2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/55927A derivation of the standard symmetry and leptoquark family structure is presented that is more straightforward than a previous derivation.5 pages; pdf also at http://www.7stones.com/Homepage/history.htmlHigh Energy Physics - Theory(1,9)-spacetime --> (1,3)-spacetime: Reduction => U(1)xSU(2)xSU(3)text