not participated in any provincial election since their respective incorporation as cities. In addition, Section 3 of BP 51 also made Baguio a highly urbanized city irrespective of its income, due to its importance as the host to the official summer residences of the President and the Supreme Court. A Supreme Court case decided two days before election day upheld the legality of BP 51 in depriving the voters of Cebu City the power to elect officials for the province of Cebu. Per Section 3 of BP 51, all other cities were considered "component cities" of the provinces in which they are geographically located, or the provinces of which they were originally a part. Despite considering all other cities as part of their respective provinces, under BP 51 the eligibility of voters to participate in provincial elections were still determined by their cities' respective charters (as amended). The voters of a total of thirteen "component cities" continued to be ineligible to vote for provincial officials for the local elections of 1980. Nine of these were cities with charters (as amended) that expressly prohibited participation in provincial elections: Dagupan, General Santos, Iloilo, Mandaue, Naga, Ormoc, Oroquieta, San Carlos (Pangasinan) and Zamboanga. The remaining four — Bais, Canlaon, Cotabato and Ozamiz — were cities whose charters were silent on participation in provincial elections; BP 51 upheld the 1951 Supreme Court decision on Teves, et al. v. Commission on Elections by barring their residents from participating in the election of provincial officials. 1983–1987 Batas Pambansa Bilang 337 (Local Government Code of 1983), approved on February 10, 1983, further refined the criteria by which cities can be classified as highly urbanized cities. Under BP 337 a city that had at least 150,000 inhabitants and an income of at least 30 million was to be declared highly urbanized by the Minister of Local Government within thirty days of the city having met the requirement. The cities of Angeles (October 13, 1986), Bacolod (September 27, 1984), Butuan (February 7, 1985), Cagayan de Oro (November 22, 1983), Iligan (November 22, 1983), Olongapo (December 7, 1983), and Zamboanga (November 22, 1983) became HUCs in this manner. The residents in most of these cities lost their right to participate in provincial elections for the first time. The two exceptions are: Iloilo City, which had already been deprived of the right to vote for provincial officials in 1959 by virtue