115 (b) performing the function in terms of section 115; and (c) performing such other functions as may be assigned by this Constitution or any other law. (4) Members of the Council of Chiefs shall be divided into three classes of four each and the first class shall vacate office at the expiry of two years, the second class shall vacate office at the expiry of three years and the third class shall vacate office at the expiry of four years. (5) Chiefs in the respective regions may meet as and when necessary but at least twice a year. The Law of Swaziland 252. (1) Subject to the provisions of this Constitution or any other written law, the principles th and rules that formed, immediately before the 6 September, 1968 (Independence Day), the principles and rules of the Roman Dutch Common Law as applicable to Swaziland since 22nd February 1907 are confirmed and shall be applied and enforced as the common law of Swaziland except where and to the extent that those principles or rules are inconsistent with this Constitution or a statute. (2) Subject to the provisions of this Constitution, the principles of Swazi customary law (Swazi law and custom) are hereby recognised and adopted and shall be applied and enforced as part of the law of Swaziland. (3) The provisions of subsection (2) do not apply in respect of any custom that is, and to the extent that it is, inconsistent with a provision of this Constitution or a statute, or repugnant to natural justice or morality or general principles of humanity. (4) Parliament may ­ (a) provide for the proof and pleading of the rule of custom for any purpose; (b) regulate the manner in which or the purpose for which custom may be recognised, applied or enforced; and (c) provide for the resolution of conflicts of customs or conflicts of personal laws. Subordinate legislation 253. (1) An Act of Parliament may make provision conferring functions on a joint sitting of the chambers of Parliament with respect to any subordinate legislation (that is to say any instrument having the force of law made under an Act of Parliament) and for the summoning and procedure of a joint sitting for the purpose of the exercise of those functions. (2) Every subordinate legislation shall before commencement be laid before each chamber of Parliament for a period of at least fourteen days. (3) Subject to the provisions of subsection (4), if during the period of fourteen days that legislation is not called upon for debate by motion of any member, then the legislation shall be deemed to have been approved by the chamber concerned. 115