name a office holder whose predecessor is bingu wa mutharika and has son named teodoro nguema obiang mangue ?
SELECT DISTINCT var_uri where brack_open var_uri dbo_predecessor dbr_Bingu_wa_Mutharika sep_dot var_uri dbo_child dbr_Teodoro_Nguema_Obiang_Mangue sep_dot var_uri a dbo_OfficeHolder brack_close