#include<bits/stdc++.h>
using namespace std;
const int64_t inf = 1e18;
const int64_t mod = 998244353;
// const int64_t mod = 1000000007;

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    int n;
    cin >> n;
    int tt;
    cin >> tt;
    vector<int> a(n);
    for (int i = 0; i < n; i++) {
        cin >> a[i];
    }
    vector<int> s(n+1);
    s[0] = 0;
    for (int i = 0; i < n; i++) {
        s[i+1] = s[i]^a[i];
    }
    for (;tt--;) {
        int l, r;
        cin >> l >> r;
        l--;
        cout << (s[l]^s[r]) << endl;
    }
}