I think its either correcting mistakes in capitalization and spelling or deleting paragraphs that do not match the topic
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(Thomas Hardy, "The Convergence of the Twain") and (Sara Teasdale, "Wisdom")
Answer:
i think oc they should clearly convey their purpose
Its usually written as the first sentence of the paragraph (although its not necessary but preferred) It basically includes the main idea or the topic of the paragraph (doesn't have to be word for word), and states the main points of the paragraph briefly.