Please choose the correct ending to complete the given sentence: Health: [header] How to use an incentive spirometer [title] Put the incentive spirometer together, if necessary. [step] If you haven't used the device before, you may need to assemble it. Wash your hands, then remove the pieces from the plastic bags.

Ending1: Run the spirometer under the faucet in the shower. Run the spirometer without checking for leaks. Ending2: Stretch out the flexible tubing with the mouthpiece, then connect the side without the mouthpiece to outlet. The outlet is on the bottom right-hand side of the base. Ending3: Wait ten to thirty minutes to allow everything time to work completely. [substeps] Make sure any accessories, buckles, safety pins, or clips have not detached from the viacetone. Ending4: Locate the wires that connect the spirometer to the bag. [substeps] Use the wires from each of the copper connections.

Answer format: ending1/ending2/ending3/ending4