C#
var wave = str.Select((c, i)=> str.Substring(0, i) + str.Substring(i, 1).ToUpper() + str.Substring(i+1, str.Length-i-1)).Where(s => !s.All(c => c.ToString() == c.ToString().ToLower()));
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C#
var wave = str.Select((c, i)=> str.Substring(0, i) + str.Substring(i, 1).ToUpper() + str.Substring(i+1, str.Length-i-1)).Where(s => !s.All(c => c.ToString() == c.ToString().ToLower()));