#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for(int i = 0; i < (n);i++)
#define sz(x) int(x.size())
typedef long long ll;
typedef long double ld;
typedef pair<int,int> P;
typedef pair<ll, int> PL;
constexpr int INF = 2e9;

int main() {
  int n, q;
  cin >> n >> q;
  vector<int> a(n);
  rep(i,n) cin >> a[i];
  vector<int> cumulative_xor(n + 1, 0);
  for (int i = 0; i < n; i++) cumulative_xor[i + 1] = cumulative_xor[i] ^ a[i];

  while (q--) {
    int l, r;
    cin >> l >> r;
    cout << (cumulative_xor[r] ^ cumulative_xor[l - 1]) << endl;
  }
  return 0;
}