Search for a sets elements in C#
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var chars = new HashSet<Char> { 'A', 'B', 'C', 'D' };
var containA = chars.Contains('A');
//containA is True
var containE = chars.Contains('E');
//containE is False
var chars2 = new HashSet<Char> { 'A', 'B' };
var containAll = chars.IsSupersetOf(chars2);
//containAll is True
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