The claims that are supported by relevant evidence are:
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Drinking coffee is good for you. Two recent studies have shown that coffee drinkers live longer. - This claim is supported by the evidence of two recent studies.
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Students should use e-books. Many suffer from back trouble from carrying so many books in their backpacks. - This claim is supported by the evidence that carrying heavy books can lead to back trouble, which suggests that e-books could alleviate this issue.