I want to know the answer to the following question:
Which article stipulates that the structure of each Federal State's government must "conform to the principles of republican, democratic, and social government, based on the rule of law"?
All the background I'm provided with is that "The states are parliamentary republics and the relationship between their legislative and executive branches mirrors that of the federal system: the legislatures are popularly elected for four or five years (depending on the state), and the Minister-President is then chosen by a majority vote among the Landtag's members.". Is that enough to answer the question?
Answer: no