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You should exercise regularly.
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You should have a positive mind.
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You should see a doctor regulary.
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You should find a way to relax.
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You shouldn't sleep irregular hours.
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You should stop smoking. / You shouldn't start smoking.
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You should not eat too much sugar.
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You should talk to someone if you are worried.
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You should protect your skin by wearing sunscreen.
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You shouldn't eat too much junk food.
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You should take regualr exercise.
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You shouldn't spend too much time on your phone.