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List<Int32> list1 = new List<Int32>();
List<Int32> list2 = new List<Int32>();
list1.Add(1);
list1.Add(2);
list2.Add(2);
list2.Add(3);
var list3 = from l1 in list1 from l2 in list2 where l1 == l2 select l1;
foreach(var i in list3)
Console.WriteLine(i);