context: How to identify swimmer's ear
Sense an itch in your ear.
Itching in the outer ear and ear canal is the first sign of swimmer's ear.
Because one of the main causes of an ear infection is through your ear being exposed to water, pay particular attention to itching that arises in the days soon after you have gone swimming.
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next sentence for the context: Infections due to fungi cause greater itchiness than those due to bacteria. Look for redness inside your ear.

context: How to secure your luggage for a flight
Find out what you can pack.
Airlines post their restrictions online, so you should be able to check them easily. Avoid packing inappropriate or disallowed items, as that will prevent you from having to open your bag and remove them in the airport.
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next sentence for the context: This will weaken your other security steps, making your bag more vulnerable. Consider buying a hard-sided suitcase.

context: Three boys are sitting on the side of a mountain, putting on gear. they
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next sentence for the context: skate around the road winding around the mountain.

context: How to remove permanent marker from a white board
Use a dry-erase marker to draw over the permanent ink.
Cover the marks as completely as you can, and be sure there the dry-erase marker isn't dried out and has plenty of ink.
It doesn't matter what color dry erase marker you use.
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next sentence for the context:
Wipe off the ink with a clean wipe board eraser or a soft rag. Both the permanent and dry-erase marker should come off easily.