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How does an author develop central ideas to achieve a goal?

This is also known as the main idea, what is the author trying to tell you, what is the main point they're getting across? Depends on the goal, but in simplest terms, the answer is- to let the reader understand the main idea that leads up to their main achievement.

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explanation:

repetition is used to emphasize a feeling or idea, create rhythm, and/or develop a sense of urgency.