which silver medalist of the canoeing at the 2012 summer olympics – men's k-2 1000 metres was also the flagbearer of the portugal at the 2004 summer olympics
SELECT DISTINCT var_uri where brack_open dbr_Canoeing_at_the_2012_Summer_Olympics_–_Men's_K-2_1000_metres dbo_silverMedalist var_uri sep_dot dbr_Portugal_at_the_2004_Summer_Olympics dbp_flagbearer var_uri brack_close