using System;
using System.Collections.Generic;
using System.Linq;
public class Test
{
public static void Main()
{
var a = new[]
{
"1,2,3",
"4,5",
"6"
};
var b = a.SelectMany(x => x.Split(',')).ToArray();
foreach (string s in b)
Console.WriteLine(s);
}
}
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