| Topic Name | Questions | Unanswered | Members | building | 287 | 128 | 220 |
|---|---|---|---|
| map | 113 | 59 | 85 | construction | 166 | 93 | 177 |
| land | 169 | 59 | 119 | point | 564 | 209 | 235 |
| drawing | 106 | 34 | 95 | location | 164 | 75 | 114 |
| level | 392 | 189 | 194 | survey | 91 | 32 | 91 |
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