TASK DEFINITION: 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.
PROBLEM: Who is the leader of the senate 2018?

SOLUTION: Who was the majority leader of the senate in 2018?

PROBLEM: How many volumes of sword art online are there?

SOLUTION: How many light novel volumes of sword art online are there?

PROBLEM: Who controlled the economy of the incan empire?

SOLUTION:
Who were the small groups that controlled the economy of the incan empire?