equation icon  @G - @ /\ - 2G e/\ + x /\ + x eG + 2x x + _O_B ee + 2h f = 0, (75) abc a bc a[b c]e a bc a ebc a[b c] a ebc a[b c] @aGbcd- @bGacd + 2x[ab]/\cd + 2G[ae| c|Gb]ed + 2x[a|dxb]c + _O_eabeEef efcd -2h f + 2h f + 4h h /\ = 0. (76) c[a b]d d[a b]c c[a b]d