Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to build a cat condo [title] Find a cardboard box large enough to fit your cat. [step] If there is a large cardboard box that your cat already likes to sleep in, consider using that. [title] Lay the box down on its side.

Ending1: [step] Your cardboard box should face in the direction the cat sleeps. If you see your cat napping, place the box down wherever the cat sleeps if possible. Ending2: [step] If the box has a top part that folds down, cut it off using a box cutter. You can also fold the flaps inward and secure them with glue. Ending3: [step] Position it so that the front edges of the box sit at two equal diagonal corners. The top of the box should be facing down toward the floor of the room and the bottom of the box should rest squarely against the wall. Ending4: [step] You will need to install two plywood sheets, if you want your cat to sleep on their paws. Place one sheet over the edge of the box that your cat sleeps on.

Answer format: ending1/ending2/ending3/ending4