which country has leaders khalifa bin zayed al nahyan and khalifa bin zayed al nahyan ?
SELECT DISTINCT var_uri where brack_open var_uri dbo_leader dbr_Khalifa_bin_Zayed_Al_Nahyan sep_dot var_uri dbo_leader dbr_Khalifa_bin_Zayed_Al_Nahyan sep_dot var_uri a dbo_Country brack_close