Please choose the correct ending to complete the given sentence: Home and Garden: [header] How to form concrete walls [title] Measure out the area of your wall and drive stakes into the corners. [step] Tie string between the stakes to serve as guides for digging. [title] Dig out the area of the wall.

Ending1: [step] Use an rope and a broom or hoe to dig up the area of your wall. [title] Dig holes in the wall to accommodate the concrete slab. Ending2: [title] Line the wall up horizontally with stakes. [title] Staple the sides of the stake holes to the ground. Ending3: [step] Use that space to mark out the stakes with clamps. [title] Use the hammer to pound down the stakes. Ending4: [step] You should dig down below the frost line, which is usually about 1 foot (or 30 cm) down. If building a retaining wall on a slope, make sure the bottom of your hole is flat.

Answer format: ending1/ending2/ending3/ending4