#include <bits/stdc++.h>

using namespace std;

#define REP(i,n) for(int i=0; i<(int)(n); i++)
#define FOR(i,b,e) for (int i=(int)(b); i<(int)(e); i++)
#define ALL(x) (x).begin(), (x).end()

const double PI = acos(-1);

int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);

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

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

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