Section 54A(1) in The Government Of Union Territories Act, 1963
(1)Notwithstanding anything contained in this Act (including provisions relating to the strength of the Legislative Assembly of the Union territory of Arunachal Pradesh), until the Legislative Assembly of the Union territory of Arunachal Pradesh has been duly constituted and summoned to meet for the first session under and in accordance with the provisions of this Act, there shall be a provisional Legislative Assembly which shall consist of members, being those persons referred to in clauses (b), (c) and (d) of section 3 of the North-East Frontier Agency (Administration) Supplementary Regulation, 1971 (4 of 1971) and who are functioning, immediately before the commencement of this Act in the Union territory of Arunachal Pradesh, as members of the Pradesh Council constituted under the said section 3.