Three. Should be careful to keep the pins surrounding land to remain strong. To prevent the boats from the side up . And the horizontal coordinates. And sea levels are not .
3. be careful to maintain a master title deed land district pins remain stable, strong steps to prevent the problem from getting more side space and can put the coordinates on Plains and sea level. .
3. should be careful keep the pins in the title deed to maintain strong security to prevent the problem of cutting-edge rose from nearby areas and can be laid flat and the northing sea level.