Please choose the correct ending to complete the given sentence: Health: [header] How to prevent swimmer's ear (otitis externa ) [title] Use earplugs when you go swimming. [step] Before you go into the shower at your pool, put one earplug in each ear. Mould the earplugs to your ears so that they stay in while you are swimming.

Ending1: In between swims, you should keep your earplugs dry by keeping them in a small earplug case or in a sealed plastic bag. [substeps] Get pliable earplugs from your physician's office. Ending2: [substeps] Remember that the otitis mouthpiece stays in place once you get out of the water. The opaque coating on the mouthpiece prevents water from entering your ear canals. Ending3: Make sure to find earplugs that fit comfortably without scratching your ears, as they can itch and sting. [substeps] Larger plugs can prevent swimmer's ear infections. Ending4: [substeps] If you use contact lenses, focus your body's attention on the lenses instead of the water. [title] Make sure your skin is smooth before and after swimming.

Answer format: ending1/ending2/ending3/ending4