介绍性文本1.引文，生效和解释2.主要条例第4条修正案3.主要条例第5条修正案4.主要条例第12条修正案5.主要条例第16条修正案6.主要条例第17条修正案7.主要条例第18条修正案主要条例8.主要条例第19条的修订签署解释性说明

Introductory Text1.Citation, commencement and interpretation2.Amendment to regulation 4 of the principal Regulations3.Amendment to regulation 5 of the principal Regulations4.Amendment to regulation 12 of the principal Regulations5.Amendment to regulation 16 of the principal Regulations6.Amendment to regulation 17 of the principal Regulations7.Amendment to regulation 18 of the principal Regulations8.Amendment of regulation 19 of the principal RegulationsSignatureExplanatory Note