#include <bits/stdc++.h>

using namespace std;

using ll = long long;

constexpr char newl = '\n';

int main() {
    cin.tie(nullptr);
    ios::sync_with_stdio(false);

    int n, q;
    cin >> n >> q;

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

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

    return 0;
}