what is the flagbearer of the czechoslovakia at the 1952 winter olympics and czechoslovakia at the 1956 winter olympics
SELECT DISTINCT var_uri where brack_open dbr_Czechoslovakia_at_the_1952_Winter_Olympics dbp_flagbearer var_uri sep_dot dbr_Czechoslovakia_at_the_1956_Winter_Olympics dbp_flagbearer var_uri brack_close