| Value | Category | Cases | |
|---|---|---|---|
| 1 | Dirt | 84 |
20.9%
|
| 2 | Stone bricks | 25 |
6.2%
|
| 3 | Cement | 280 |
69.8%
|
| 99 | Others (specify) | 12 |
3%
|
| Sysmiss | 54 |