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(a) any other existing law; (b) a law of a House of Assembly; (c) an Act of the National Assembly; or (d) any provision of this Constitution. (4) In this section, the following expressions have the meanings assigned to them, respectively – (a) “appropriate authority” means – (i) the President, in relation to the provisions of any law of the Federation, (ii) the Governor of a State, in relation to the provisions of any existing law deemed to be a law made by the House of Assembly of that State, or (iii) any person appointed by any law to revise or rewrite the laws of the Federation or of a State; (b) “existing law” means any law and includes any rule of law or any enactment or instrument whatsoever which is in force immediately before the date when this section comes into force or which, having been passed or made before that date comes into force after that date; and (c) “modification” includes addition, alteration, omission or repeal. (5) Nothing in this Constitution shall invalidate the following enactments, that is to say – (a) the National Youth Service Corps Decree 1993; [Cap. N84] (b) the Public Complaints Commission Act; [Cap. P37] (c) the National Security Agencies Act; [Cap. N74] (d) the Land Use Act, [Cap. L5] 204 The Constitution of the Federal Republic of Nigeria Updated with the First, Second, Third, Fourth and Fifth Alterations