using System;
using System.Collections.Generic;
using System.Linq;
public class Test
{
public static void Main()
{
var lst = (new[] {1, 2, 3}).SelectMany(x =>
from it in new[] {0, 10} select it + x);
Console.WriteLine(string.Join(", ", lst.Select(x => x.ToString()).ToArray()));
}
}
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