| Value | Category | Cases | |
|---|---|---|---|
| 1 | Mud | 26 |
28%
|
| 2 | Brick | 14 |
15.1%
|
| 3 | Cement | 52 |
55.9%
|
| 4 | Other | 1 |
1.1%
|
| Sysmiss | 1 |