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Union

Union returns all the elements of the first sequence, followed by all the elements of the second, but removes any duplicates:

 
using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;

class Program
{
    static void Main()
    {
        int[] seq1 = { 1, 2, 3 };
        int[] seq2 = { 3, 4, 5 };

        IEnumerable<int> union = seq1.Union(seq2);

        foreach (int i in union)
        {
            Console.WriteLine(i);
        }

    }
}

The output:


1
2
3
4
5
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