equation icon  1 [ ] 1 [ ] Smn = --- 2r2- 3pabpab umun + --- 2r2 + 4rp + pabpab - 4qaqa hmn 24 24 - 1-(r + 2p)pmn + pa<mpn>a + q<mqn> + 1rq(mun) - -1-qapa(mun). (88) 12 3 12