// https://pastebin.com/fuw4Uizk
// ĐÂĂÊÔƠƯẤẮẾỐỚỨẦẰỀỒỜỪẬẶỆỘỢỰШ
// đâăêôơưấắếốớứầằềồờừậặệộợựш

public class Test
{
	public static bool Run()
	{
		string() orig1 = "MiXeD cAsE ĐÂĂÊÔơưấắếỐỚỨẦẰềồờừậẶỆỘỢỰш"; //FAIL: cl
		string orig2 = "MiXeD cAsE ĐÂĂÊÔơưấắếỐỚỨẦẰềồờừậẶỆỘỢỰш";
		string() new1 = orig1.ToUpper();
		string() new2 = orig2.ToUpper();
		return orig1 == "MiXeD cAsE ĐÂĂÊÔơưấắếỐỚỨẦẰềồờừậẶỆỘỢỰш"
			&& orig2 == "MiXeD cAsE ĐÂĂÊÔơưấắếỐỚỨẦẰềồờừậẶỆỘỢỰш"
			&& new1 == "MIXED CASE ĐÂĂÊÔƠƯẤẮẾỐỚỨẦẰỀỒỜỪẬẶỆỘỢỰШ"
			&& new2 == "MIXED CASE ĐÂĂÊÔƠƯẤẮẾỐỚỨẦẰỀỒỜỪẬẶỆỘỢỰШ";
	}
}