Question: Hong Kong Macau cultural exchange was a trip that tested which law who's purpose was to fulfil Article 23 of the Macau Basic Law?
Sentence (from "Macau national security law"): Taken into effect on 3 March 2009, the purpose of the law is to fulfil Article 23 of the Macau Basic Law, the constitutional document of the Macau Special Administration Region.
Relevant evidence: Yes