using System;
using System.Linq;
using System.Collections.Generic;
 
public class Test
{
 
	public static void Main()
	{
	   Dictionary<string, List<String>> dict = new Dictionary<string, List<String>>();
        dict.Add("STAR-016", new List<string>() { 
            "value a", "value b", "value c", "value 1, value 2, value 3", "value d"
        });
 
        foreach (var kvp in dict)
        {
            for (int i = kvp.Value.Count -1; i >= 0; i--)
            {
                string str = kvp.Value[i];
                if (str.Contains(','))
                {
                    string[] parts = str.Split(',').Select(p => p.Trim()).ToArray();
                    kvp.Value.RemoveAt(i);
                    kvp.Value.InsertRange(i, parts);
                }
            }
        }
 
        foreach(var kvp in dict)
        foreach(string s in kvp.Value)
        Console.WriteLine(s);
	}
 
}
 
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