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Hi John, > I'm not sure how Bill's answer fits into this "standard type theory" > answer. Is it equivalent using different language? No, my answer only addressed the specific case and why it threw the Exception it did. Cheers, Bill ---------------------------------------------------------- Bill Hibbard, SSEC, 1225 W. Dayton St., Madison, WI 53706 hibbard@xxxxxxxxxxxxxxxxx 608-263-4427 fax: 608-263-6738 http://www.ssec.wisc.edu/~billh/vis.html
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