You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "who was prime minister when britain joined the common market?" whose answer is Edward Heath.
Each document should contain about 30 words, and these documents should contain useful information.

Query: Prime Minister of the UK in 1973
Useful Output:

Doc 1: Harold Wilson, elected 45 years ago this month, stood closely by the Jewish state, including through two major wars.
Doc 2: In this video I assess the premiership of UK Prime Minister, Tony Blair, who was in office from the landslide election victory in 1997 to
Doc 3: James Callaghan. Labour 1976 to 1979. Harold Wilson. Labour 1974 to 1976; Labour 1964 to 1970. Sir Edward Heath. Conservative 1970 to 1974. Sir Alec Douglas-
Doc 4: Sir Robert Walpole is generally regarded as the first Prime Minister in the modern sense; although adoption of the phrase "Prime Minister" in any formal or
Doc 5: This article provides an historical overview of how the British Prime Minister's Office came into being, its subsequent development and the staff attached to