Note: Beginning with this column, it will be increasingly important for readers to refer to our glossary, which can be found on the author’s Web sites ( and with a listing of previous columns and articles. Our glossary-defined terms form a closely knit conceptual network, and none of these terms can be fully understood apart from their semantic connections with other terms in the Glossary. And a note on the use of italics: we use italics for emphasis, but we also italicize the initial occurrence, from this column forward, of glossary-defined terms.


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