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[Editor's Note: This article represents a departure—the last one—from the policy announced in “From the Editor,” this issue, to the effect that notes of criticism (and rejoinders thereto) will henceforth appear as “Letters to the Editor.” Having allowed the authors’ critics to appear in the regular text section, it seems only fair to allow the authors the same status for their reply.]
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Anderson et al. (1977) studied this question.
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