A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first sentence because it introduces the main topic. It tells us about Mário de Andrade and the mission he sent. It does not need other sentences for context. It sets up the main idea without going into details. Why other lines are not chosen? The other paragraphs are not chosen because they do not stand alone. For example, Paragraph 2 starts with 'His intention,' which needs context from the first paragraph. Paragraph 3 starts with 'But,' which is a conjunction. Paragraph 4 starts with 'But the Brazilian mission’s collection,' which uses 'the' and needs prior information.

Concluding sentence: Why this is the last line? This paragraph is the last sentence because it concludes the discussion about the mission. It shows the final outcome of the mission's work. It wraps up the main idea by explaining what happened to the collection.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): This pair connects because the second paragraph explains the intention of the mission mentioned in the first paragraph. It follows a logical order where the first paragraph introduces the mission and the second explains what the mission aimed to do.
• Pair 2 (Paragraph 2 → Paragraph 3): This pair connects because the third paragraph gives examples of what the mission recorded. It follows the broader to specific strategy, where the second paragraph talks about the intention and the third provides specific details about the recordings.
• Pair 3 (Paragraph 3 → Paragraph 4): This pair connects because the fourth paragraph shows the result of the recordings mentioned in the third paragraph. It follows a cause and effect relationship, where the recordings did not lead to the expected outcome.