It should be noted that the central idea is the main idea that's conveyed in a literary work.
What is a central idea?
Your information is incomplete. Therefore, an overview will be given. A central idea simply means the main idea that's in a story. It's simply what the author wants the readers to know.
In this case, it's important to read and understand the passage, then it can be easy to deduce the relationship that the people had and why they were trying to separate from others.
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