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

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