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g1smd - 5:04 pm on Dec 14, 2005 (gmt 0)
Removing any one parameter, allows the search to proceed. If you remove the &num=100 parameter, make a search, and then click the "In order to show you the most relevant results, we have omitted some entries very similar to the 400 already displayed. If you like, you can repeat the search with the omitted results included." message (which adds the &num=100 parameter back on to the search URL) it then works OK. If you add the &num=100 parameter back on by hand, then you get the error message again.
I get the error message for any search that includes site: and inurl: and &num=100 in the search URL.