| Value | Category |
|---|---|
| 1 | Stone, concrete |
| 2 | Cement blocks |
| 3 | Clay bricks |
| 4 | Zinc or iron |
| 5 | Wood or board |
| 6 | Mud & bricks |
| 7 | Mud (stick) |
| 8 | Reed, bamboo, grass or mat |
| 9 | Other |
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