#include <bits/stdc++.h>
using namespace std;
int main(){
  int N, Q;
  cin >> N >> Q;
  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 (int i = 0; i < Q; i++){
    int l, r;
    cin >> l >> r;
    l--;
    cout << (s[r] ^ s[l]) << endl;
  }
}