Please choose the correct ending to complete the given sentence: Home and Garden: [header] How to construct a sandstone wall [title] Pick the location. [step] Make sure you aren't preventing natural run-off water from the position of the wall and footing. Observe the land in question for a few days prior to doing any work.

Ending1: Trace the run-off the day before the project, take your measurements and cut out a path to the location. [substeps] The path may be difficult to follow, but be sure to have all your permits completed in two days. Ending2: Pay special attention to the area after it rains. You don't want to disrupt the flow of water so that it floods into your neighbor's property. Ending3: Select a location that has not been disturbed in a long time. The distance of your yard from your home is always a good place to begin for any repairs you might have to make. Ending4: After the initial survey, use this as a basis for final calculations. Later, you can calculate your actual cost.

Answer format: ending1/ending2/ending3/ending4