/**
 *   @FileName	a.cpp
 *   @Author	kanpurin
 *   @Created	2020.06.26 00:04:39
**/

#include "bits/stdc++.h" 
using namespace std; 
typedef long long ll;

int main() {
    int n,q;cin >> n >> q;
    vector<int> sum(n+1);
    for (int i = 0; i < n; i++) {
        int a;cin >> a;
        sum[i + 1] = a ^ sum[i];
    }
    for (int i = 0; i < q; i++) {
        int l,r;cin >> l >> r;
        cout << (sum[l-1] ^ sum[r]) << endl;
    }
    return 0;
}