#include <iostream>
#include <vector>

void solve() {
    int n, q;
    std::cin >> n >> q;

    std::vector<int> xs(n + 1, 0);
    for (int i = 0; i < n; ++i) {
        int x;
        std::cin >> x;
        xs[i + 1] = xs[i] ^ x;
    }

    while (q--) {
        int l, r;
        std::cin >> l >> r;
        std::cout << (xs[l - 1] ^ xs[r]) << "\n";
    }
}

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

    solve();

    return 0;
}