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yield Return -> Yield, not yield Return -> yield Return
http://msdn.microsoft.com/en-us/library/vstudio/dscyy5s0.aspx?cs-save-lang=1&cs-lang=vb#code-snippet-2
http://msdn.microsoft.com/en-us/library/vstudio/dscyy5s0.aspx?cs-save-lang=1&cs-lang=vb#code-snippet-2