which office holder's predecessor is hamdan bin zayed bin sultan al nahyan and his associate is saif bin zayed al nahyan ?
SELECT DISTINCT var_uri where brack_open var_uri dbo_predecessor dbr_Hamdan_bin_Zayed_bin_Sultan_Al_Nahyan sep_dot var_uri dbo_associate dbr_Saif_bin_Zayed_Al_Nahyan sep_dot var_uri a dbo_OfficeHolder brack_close