what is the flagbearer of the el salvador at the 2012 summer olympics and el salvador at the 2004 summer olympics
SELECT DISTINCT var_uri where brack_open dbr_El_Salvador_at_the_2012_Summer_Olympics dbp_flagbearer var_uri sep_dot dbr_El_Salvador_at_the_2004_Summer_Olympics dbp_flagbearer var_uri brack_close