using System.Text;
using System;

public class Hello
{
    static void Main()
    {
        string[] line = Console.ReadLine().Trim().Split(' ');
        var n = int.Parse(line[0]);
        var q = int.Parse(line[1]);
        line = Console.ReadLine().Trim().Split(' ');
        var a = Array.ConvertAll(line, int.Parse);
        getAns(n, q, a);
    }
    static void getAns(int n, int q, int[] a)
    {
        var sb = new StringBuilder();
        var b = new int[n];
        b[0] = 0 ^ a[0];
        for (int i = 1; i < n; i++)
            b[i] = b[i - 1] ^ a[i];
        for (int i = 0; i < q; i++)
        {
            string[] line = Console.ReadLine().Trim().Split(' ');
            var L = int.Parse(line[0]) - 1;
            var r = int.Parse(line[1]) - 1;
            sb.Append(L == 0 ? b[r].ToString() + "\n" : (b[r] ^ b[L - 1]).ToString() + "\n");
        }
        Console.Write(sb);
    }
}