using System;
using System.Linq;

public class Test
{
	public static void Main()
	{
		var s = new string[] {
            "a0|a1|a2|a3|a4|a5|a6|a7|a8|a9|a10|a11|a12",
            "b0|b1|b2|b3|b4|b5|b6|b7|b8|b9|b10|b11|b12"
        };

        var result = s.Select(a => a.Split(new[] { '|' }, StringSplitOptions.None))
            .Select(a => new {
                Column1 = a[2].Trim(),
                Column2 = a[5].Trim(),
                Column3 = a[6].Trim(),
                Column4 = a[11].Trim()
        });
        foreach (var entry in result)
            Console.WriteLine(entry.Column1 + ", " + entry.Column2 + ", "
                 + entry.Column3 + ", " + entry.Column4);
	}
}