#include <iostream>
#include <vector>

using namespace std;

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);

    int n, q;
    if (!(cin >> n >> q)) return 0;

    vector<long long> p(n + 1, 0);
    for (int i = 1; i <= n; ++i) {
        long long x;
        cin >> x;
        p[i] = p[i - 1] ^ x;
    }

    while (q--) {
        int l, r;
        cin >> l >> r;
        cout << (p[r] ^ p[l - 1]) << "\n";
    }
    return 0;
}