| 2.1. Letter from Devendra Saksena |
| 2.2. Letter from Walter C. Willett |
| 2.3. Letter from Ali M. Mansoor |
| 2.4. Letter from Arjoon Suddhoo |
| 2.1. Letter from Devendra Saksena |
| 2.2. Letter from Walter C. Willett |
| 2.3. Letter from Ali M. Mansoor |
| 2.4. Letter from Arjoon Suddhoo |