A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first sentence because it introduces the main topic of asking for leave. It does not need another sentence for context. It is a general statement about the notice period. Why other lines are not chosen? Paragraph 2 starts with 'Upon returning,' which needs context from a previous sentence. Paragraph 3 starts with 'Employee should have,' which is not a complete thought alone. Paragraph 4 starts with 'If you leave,' which also needs context.

Concluding sentence: Why this is the last line? This paragraph is the last sentence because it summarizes the main points about employee rights after leave. It wraps up the discussion about leave and benefits.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects to Paragraph 1 because it continues the topic of leave. It explains what happens after the notice is given. This shows a logical order of ideas.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects to Paragraph 2 because it talks about a different situation of leave. It shows a cause and effect relationship. If the leave is longer than 60 days, the outcome is different.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects to Paragraph 3 because it talks about the rights of the employee. It gives more information about what happens after the leave, showing a broader to specific strategy.