Please choose the correct ending to complete the given sentence: Computers and Electronics: [header] How to climb a brick wall [title] Plan your route first. [step] Regular climbing techniques will only work if some of the grout between bricks is missing or if bricks are jutting out. Basically, if the wall is perfectly smooth, you're not going to be able to climb it with standard techniques.

Ending1: Look up the wall, and see if you can find enough handholds and toeholds to get you up the wall. [substeps] Try to visualize your climb up the wall. Ending2: On the other hand, if the wall is uneven and has a lot of loose, smaller bricks, you may have to climb it by less substantial methods. [substeps] You should also set an alarm if the weather isn't nice. Ending3: Alternatively, you might try removing loose bricks with open edges and then taking them down with your fingernails, scraping off any existing grout material, or using the tools provided. [substeps] Know where you're going before you try climbing the wall. Ending4: The best way to avoid these problems is to walk or run along the wall. Keep a journal about your walking habits and identify places where you've taken precautions.

Answer format: ending1/ending2/ending3/ending4