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System.Text.StringBuilder sb = new System.Text.StringBuilder();
sb.Append("a");
sb.Append("b");
sb.Append("c");
string result = sb.ToString();
//result = abc
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System.Text.StringBuilder sb = new System.Text.StringBuilder();
sb.Append("a");
sb.Append("b");
sb.Append("c");
string result = sb.ToString();
//result = abc
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