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(1) Subject to this Article, every person born in Singapore after 16th September 1963 shall be a citizen of Singapore by birth.
(2) A person shall not be a citizen of Singapore by virtue of clause (1) if at the time of his birth —
(a) his father, not being a citizen of Singapore, possessed such immunity from suit and legal process as is accorded to an envoy of a sovereign power accredited to the President;
(b) his father was an enemy alien and the birth occurred in a place then under the occupation of the enemy; or
(c) Neither of his parents was a citizen of Singapore.
(3) Notwithstanding clause (2)(c), the Government may, where it considers it just and fair and having regard to all the circumstances prevailing at the time of the application, confer citizenship upon a person born in Singapore. (Art. 121)

Foreign nationals may acquire Iranian citizenship within the framework of the laws. Citizenship may be withdrawn from such persons if another State accepts them as its citizens or if they request it. (Art. 42)

(1) There shall be one status of citizenship known as “the status of a citizen of Sri Lanka”.
(2) A citizen of Sri Lanka shall for all purposes be described only as a “citizen of Sri Lanka”, whether such person became entitled to citizenship by descent or by virtue of registration in accordance with the law relating to citizenship.
(3) No distinction shall be drawn between citizens of Sri Lanka for any purpose by reference to the mode of acquisition of such status, as to whether acquired by descent or by virtue of registration.
(4) No citizen of Sri Lanka shall be deprived of his status of a citizen of Sri Lanka, except under and by virtue of the provisions of sections 19, 20, 21 and 22 of the Citizenship Act:
Provided that the provisions of sections 23 and 24 of that Act shall also be applicable to a person who became entitled to the status of a citizen of Sri Lanka by virtue of registration under the provisions of section 11, 12 or 13 of that Act.
(5) Every person who immediately prior to the commencement of the Constitution was a citizen of Sri Lanka, whether by descent or by virtue of registration in accordance with any law relating to citizenship, shall be entitled to the status and to the rights of a citizen of Sri Lanka as provided in the preceding provisions of this Article.
(6) The provisions of all existing written laws relating to citizenship and all other existing written laws wherein reference is made to citizenship shall be read subject to the preceding provisions of this Article. (Art. 26)

(1) A citizen of Singapore who is a citizen by registration or by naturalisation shall cease to be such a citizen if he is deprived of his citizenship by an order of the Government made in accordance with this Article.
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(6) The Government may, by order, deprive of her citizenship any woman who is a citizen of Singapore by registration under Article 123(2) if the Government is satisfied that the marriage by virtue of which she was registered has been dissolved, otherwise than by death, within the period of 2 years beginning with the date of the marriage.
… (Art. 129)

(1) Subject to Clause (9), the Federal Government may, upon application made by any person of or over the age of twenty-one years who is not a citizen, grant a certificate of naturalization to that person if satisfied—
(a) that—
(i) he has resided in the Federation for the required periods and intends, if the certificate is granted, to do so permanently;
(ii) (repealed);
(b) that he is of good character; and
(c) that he has an adequate knowledge of the Malay language.
… (Art. 19)

No person shall be a citizen of India by virtue of article 5, or be deemed to be a citizen of India by virtue of article 6 or article 8, if he has voluntarily acquired the citizenship of any foreign State. (Art. 9)

1. The following shall fall within the exclusive competence of the supreme state authorities of Georgia:
a) legislation on … Georgian citizenship, … (Art. 7)

The rules which govern the Saudi Arabian nationality shall be defined by the law. (Basic Law, Art. 35)

Khmer citizen shall not be deprived of his/her nationality, …
The acquisition of Khmer nationality shall be determined by law. (Art. 33)

(1) For the purposes of the foregoing provisions of this Chapter—⁴
…
(b) a woman who before that day became a federal citizen or a citizen of the Federation by registration as a citizen, or in consequence of her registration as the subject of a Ruler, under any provision of the said Agreement or of any State law authorizing the registration of women married to citizens of the Federation or to subjects of the Ruler shall be treated as a citizen by registration under Clause (1) of Article 15;
… (Art. 28)