which country is the birth place of ben-zion halfon and omar khalif mohammed abu bakr mahjour umar ?
SELECT DISTINCT var_uri where brack_open dbr_Ben-Zion_Halfon dbo_birthPlace var_uri sep_dot dbr_Omar_Khalif_Mohammed_Abu_Bakr_Mahjour_Umar dbo_birthPlace var_uri brack_close