In this task, you're given an ambiguous question (which can be answered in more than one way). Your task is to write a question that clarifies the given question in such a way that the generated question has one unique answer.

When did great britain change its name to united kingdom?
When did great britain change its name to United Kingdom of Great Britain & Ireland?

Who sang on the banks of the river?
Who sang background on the 1959 song with lyrics on the banks of the river?

Who played the marshal in who shot liberty valance?

Who played the marshal in the film who shot liberty valance?