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.

Positive Example 1 -
Input: Lucifer how many episodes are in season 3?
Output: How many episodes of season 3 of Lucifer were there, including bonus episodes?

Positive Example 2 -
Input: What is the tallest ride at six flags over Texas?
Output: What is the tallest roller coaster at six flags over Texas 2001?

Negative Example 1 -
Input: Lucifer how many episodes are in season 3?
Output: How many episodes of season 4 of Lucifer were there, including bonus episodes?

Negative Example 2 -
Input: What is the tallest ride at six flags over texas?
Output: What is the tallest roller coaster at six flags over Tempe 2001?

Now complete the following example -
Input: What led to the end of indus valley civilization?
Output: 



Output:
According to Sir Mortimer Wheeler in 1953, what led to the end of indus valley civilization?
According to many scholars, what natural phenomena led to the end of indus valley civilization by causing a reduction in water supply?
According to many scholars, a decline in what with Egypt and Mesopotamia led to the end of indus valley civilization?
What geological phenomenon led to the end of indus valley civilization?