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List<string> lis = new List<string>();
foreach(string s in ss)
{
  if(!lis.Contains(s))
  {
  lis.Add(s);
  }
}

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C# code:
string [] s=new string[]{"1","3","2","3","4","5","4"};
string[] res= s.Distinct().ToArray();

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public static string[] GetString(string[] values)
{
  List<string> list = new List<string>();
  for (int i = 0; i < values.Length; i++)
  {
  if (list.Contains(values[i]))
  list.Add(values[i]);
  }
  return list.ToArray();
}
int[] s = { 1, 2, 3, 3, 4,4,5 }; 
int[] s2= s.Distinct().ToArray();

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ÒýÓÃ

public static string[] GetString(string[] values)
{
List<string> list = new List<string>();
for (int i = 0; i < values.Length; i++)
{
if (list.C¡­¡­

UP

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var uniq = function (arr) 
{ var a = [],  
  o = {},