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Other optional information is collected only when the visitor and / or client chooses to provide us with specific information . This excludes forms of literacy practice involving speech , non-linguistic , and / or multiple modes of representation . Proper diet and / or exercise can be effective in helping to prevent or improve these conditions . The DMA remains concerned , however , about the inclusion of provisions in the legislation that could potentially lead to the creation of a government-run do-not-e-mail registry and / or a labeling requirement . To determine whether the book or journal is held by the Levy Library , please check our catalog and / or E-Journals list .