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How to use these web pages

Many of the pages in this site have both an ordinary rendition that appears on your browser by clicking on a link and another version that is more appropriate for printing.

If you want to print a hardcopy of these pages, click on the PDF icon and print it. The pdf rendition is formatted for a printed page; the ordinary html rendition is formatted for a web browser. Although the formatting details differ, they both contain the identical content.

Note

Some of the pages may also contain links to xml renditions. These are of little interest (except for me: they contain a rendition of the source code I typed in to define the pages and I use these links to identify problems...)