instruction:
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.
question:
When did the first hobbit movie come out?
answer:
When did The Hobbit: An Unexpected Journey first have its premiere in New Zealand?


question:
Who wanted to create a railroad from cape town to cairo?
answer:
Who wanted to create a railroad from cape town to cairo originally?


question:
What do brackets in an chemical equation mean?
answer:

What do square brackets in an chemical equation mean for molecules?