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The aim of the new chair is to promote historical research on the United States and Canada . If preference for an outside chair is indicated , the committee so informs the Dean . However , if a very large chair were purchased often , then it would have the effect of raising the 95th percentile , and in turn , changing the design target . By the 1980s , when Lehman attended Swarthmore , the horrors of a bad chair were coming to light .