who are the former partners of the figure skaters whose performance have been choreographed by olga volozhinskaia in the past ?
SELECT DISTINCT var_uri where brack_open var_x dbo_formerChoreographer dbr_Olga_Volozhinskaia sep_dot var_x dbo_formerPartner var_uri sep_dot var_x a dbo_FigureSkater brack_close