#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;

#define rep(i, n) for(int i = 0; i < n; ++i)

int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
            int n, q;
            cin >> n >> q;
            vector<int> a(n), b(n + 1);
            rep(i, n)cin >> a[i];
            rep(i, n)b[i + 1] = a[i] xor b[i];
            rep(i, q) {
                int l, r;
                cin >> l >> r;
                cout << (b[r] xor b[l - 1]) << '\n';
            }
    return 0;
}