"SEC. 4. The Sangguniang Pampook.—Sangguniang Pampook in each region shall include seventeen representatives elected from the different provinces component cities in each region, as follows:
"Region IX—The provinces of Basilan, one representative; Sulu, three, representatives; Tawi-Tawi, one representative; Zamboanga del Norte including the Cities of Dipolog and Dapitan, four representatives; Zamboanga del Sur including the Cities of Pagadian and Zamboanga, eight representatives;
"Region XII—The provinces of Lanao del Norte including the City of Iligan, three representative; Lanao del Sur including the City of Marawi, four representatives; Maguindanao including the City of Cotabato, four representatives; North Cotabato four representatives; and Sultan Kudarat, two representatives; and a sectoral representative each from among the youth, agricultural workers, and non-agricultural workers of the region who shall be appointed by the President on recommendation of the Sangguniang Pampook and after consultation with the associations or persons belonging to the sector concerned.
"The President shall appoint the sectoral representatives any time after the date of the election of the above members of the Sangguniang Pampook but not later than thirty (30) days thereafter.
"The President shall appoint an additional seven representatives whenever in his judgment any other sector is not properly represented in the Sangguniang Pampook as a result of the elections.
"Candidates for the position of the seventeen representatives to the Sangguniang Painpook shall be voted at large by the registered voters of their respective regions. The candidates from each province and its component cities corresponding to the number of representatives allocated under this Section, receiving the highest number of votes in the respective region, shall be declared elected."