import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.io.PrintWriter; import java.util.ArrayList; import java.util.Arrays; import java.util.Collections; import java.util.HashMap; import java.util.List; import java.util.Map; import java.util.StringTokenizer;

public class Main { public static void main(String[] args) throws IOException { FastScanner fs = new FastScanner(); PrintWriter out = new PrintWriter(System.out);

	int n = fs.nextInt();
	int m = fs.nextInt();
	int[] s = new int[n + 1];
	for(int i = 0;i < n;i++) {
		s[i + 1] = s[i] ^ fs.nextInt();
	}
	while(m-- > 0) {
		int l = fs.nextInt();
		int r = fs.nextInt();
		out.println(s[r] ^ s[l - 1]);
	}
	out.flush();
}

static class FastScanner {
	BufferedReader br;
	StringTokenizer st;

	public FastScanner() {
		br = new BufferedReader(new InputStreamReader(System.in));
	}

	boolean hasNext() throws IOException {
		while (st == null || !st.hasMoreTokens()) {
			String line = br.readLine();
			if (line == null)
				return false;
			st = new StringTokenizer(line);
		}
		return true;
	}

	public String next() throws IOException {
		hasNext();
		return st.nextToken();
	}

	public int nextInt() throws IOException {
		return Integer.parseInt(next());
	}

	public long nextLong() throws IOException {
		return Long.parseLong(next());
	}

	public double nextDouble() throws IOException {
		return Double.parseDouble(next());
	}

	public String readLine() throws IOException {
		return br.readLine();
	}
}

}

#include<bits/stdc++.h>
using namespace std;
int a[200005];
int s[200005];

int main()
{
    ios::sync_with_stdio(false);
    cin.tie(0);
   
    int n,m;
    cin>>n>>m;
    for(int i=1;i<=n;++i)
    {
        cin>>a[i];
        s[i]=s[i-1]^a[i];
    }
    while(m--)
    {
        int l,r;
        cin>>l>>r;
        cout<<(s[r]^s[l-1])<<endl;
    }

 return 0;
}

import sys
input = lambda:sys.stdin.readline().strip()

n,m=map(int,input().split())
a=[0]+list(map(int,input().split()))
s=[0]*len(a)

for i in range(1,n+1):
    s[i]=s[i-1]^a[i]

for _ in range(m):
    l,r=map(int,input().split())
    print(s[r]^s[l-1])