Please choose the correct ending to complete the given sentence: Sports and Fitness: [header] How to put a cot together [title] Take an inventory. [step] The cot should have three separate pieces: a metal frame with canvas attached to it and two separate metal rails. [substeps] When you first get the cot, the primary metal frame will likely be folded up.

Ending1: This frame, along with the canvas, will eventually be narrower. If this is the case, remove the frame and line up the hinges on the side of the frame with the two metal rails. Ending2: Different era frames may also get folded up quickly, such as cupboards fitted with shelves under the inner frame, or moving grates added to the outer frames to distribute the weight over time. Larger frames will also have double outer covers. Ending3: You should be able to see the canvas attached to the frame as it is folded, though. The two separate metal rails will be used for support, and they will slide into the ends of the attached canvas once the frame has been opened up. Ending4: Slide the metal frame over the top of the wooden frame, then slide it back on. Make sure that you space the gaps between the two frames so that you can see both sides.

Answer format: ending1/ending2/ending3/ending4