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 (02-July-2013) Well, I could cite a reference on this. Please refer Chapter 2 from the book ""Hand book on Rajputs"" written by Captain A H Bingley in 1899. The section, on ""Bais"", clearly mentions Bais as one of the major 36 Rajput Royal races with a connection to Suryavansh. I hope that forms a valid citation now for the change. 
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