A: Ah!! I've got a cramp in my foot!
B: Stop swimming and roll onto your back!
A: It really hurts!
B: It will stop hurting if you rest a while.
A: Why did you tell me to roll on my back?
B: It's easier if you just float until the pain stops.
A: It hurts even if I don't move my foot!
B: At least your face is not in the water.
A: I think the cramp went away.
B: Can you move your foot now?
A: Yes; thanks for your quick thinking.
B: No problem. Let's get to the shallow water.
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