A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first because it introduces the main topic of learning art. It sets the stage for what follows. It does not refer to any previous information. This is why it is independent. Why other lines are not chosen? Paragraph 2 starts with 'Digital painting', which is specific and assumes knowledge of the topic. Paragraph 3 starts with 'Many artists', which is also specific. Paragraph 4 starts with 'Once the basics', which refers to prior knowledge. Paragraph 5 starts with 'This blending', which refers back to earlier ideas.

Concluding sentence: Why this is the last line? This paragraph is the last because it wraps up the ideas presented. It shows the overall result of combining traditional and modern art. It gives a final thought on the topic.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects to Paragraph 1 because it continues the theme of learning art. It shows that digital painting is part of this learning process. This is a logical order.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 follows Paragraph 2 because it gives an example of how artists work in digital painting. It shows the process of starting with sketches, which is a logical flow.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects to Paragraph 3 because it talks about what artists do after they learn to sketch. It shows the next step in the process of creating art.
• Pair 4 (Paragraph 4 → Paragraph 5): Paragraph 5 follows Paragraph 4 because it explains the result of mastering the basics. It shows how traditional skills and modern tools come together, which is a clear continuation of the topic.