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string rain = "The rain in Spain falls mainly in the plain";
char[] vowels = {'a', 'e', 'i', 'o', 'u'};
Console.WriteLine(rain.Reverse().ToArray());
Console.WriteLine(rain.Where(r => !vowels.Contains(r)).ToArray());

// output ...
//nialp eht ni ylniam sllaf niapS ni niar ehT
//Th rn n Spn flls mnly n th pln
//Press any key to continue . . .