a 1990 plebiscite
... that only Ifugao consented to be part of an autonomous region in the Philippine Cordillera in a 1990 plebiscite?
... that only <a href="./Ifugao" id="mwAug" rel="mw:WikiLink" title="Ifugao">Ifugao</a> consented to be part of an autonomous region in the <a href="./Cordillera_Central_(Luzon)" id="mwAuk" rel="mw:WikiLink" title="Cordillera Central (Luzon)">Philippine Cordillera</a> in <b id="mwAuo"><a class="mw-redirect" href="./1990_Cordillera_Autonomous_Region_creation_plebiscite" id="mwAus" rel="mw:WikiLink" title="1990 Cordillera Autonomous Region creation plebiscite">a 1990 plebiscite</a></b>?