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The owner of the Web page gratefully acknowledges the following grants
from the National Science Foundation: DMS-89-02667, DMS-92-04504,
DMS-93-05601, DMS 96-26266, DMS 99-71738, DMS 02-04639, DMS
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'How often have I said to you that when you have eliminated the
impossible, whatever remains, however improbable, must be the truth?'
(Sherlock Holmes in The Sign of Four (Sir Arthur Conan Doyle,