#include <bits/stdc++.h>
using namespace std;
#pragma GCC optimize("Ofast,no-stack-protector,unroll-loops,fast-math")
const int maxn = 1e6 + 50;
int seg[2 * maxn], ans[maxn], last_pos[maxn], next_pos[maxn];
int n, m;
vector<int> v, get_val, partial_xor;
vector<pair<pair<int, int>, int> > ques;
void update(int val, int l, int r = n) {
  for (l += n, r += n; l < r; l >>= 1, r >>= 1) {
    if (l & 1) seg[l++] ^= val;
    if (r & 1) seg[--r] ^= val;
  }
}
int get_xor(int idx) {
  int res = 0;
  for (idx += n; idx; idx >>= 1) res ^= seg[idx];
  return res;
}
void sweep(int pos) {
  int val = get_val[v[pos]];
  int nxt = next_pos[pos];
  update(val, pos, nxt);
}
void input() {
  cin >> n;
  for (int i = 0; i < n; i++) {
    int b;
    cin >> b;
    if (i == 0)
      partial_xor.push_back(b);
    else
      partial_xor.push_back(partial_xor[i - 1] ^ b);
    get_val.push_back(b);
    v.push_back(b);
    last_pos[i] = n;
  }
  cin >> m;
  for (int i = 0; i < m; i++) {
    int l, r;
    cin >> l >> r;
    l--, r--;
    ques.push_back({{l, r}, i});
  }
}
void map_it() {
  sort(get_val.begin(), get_val.end());
  get_val.resize(unique((get_val).begin(), (get_val).end()) - get_val.begin());
  for (int i = v.size() - 1; i > -1; i--) {
    v[i] =
        lower_bound((get_val).begin(), (get_val).end(), v[i]) - get_val.begin();
    next_pos[i] = last_pos[v[i]];
    last_pos[v[i]] = i;
  }
  for (int i = 0; i < get_val.size(); i++) update(get_val[i], last_pos[i]);
}
void answer_ques(int i) {
  pair<int, int> p = ques[i].first;
  ans[ques[i].second] = get_xor(p.second) ^ partial_xor[p.first] ^
                        partial_xor[p.second] ^ get_val[v[p.first]];
}
void calc() {
  int go_pos = 0;
  int i = 0;
  sort(ques.begin(), ques.end());
  while (go_pos < ques.size()) {
    while (go_pos < ques.size() and i == ques[go_pos].first.first)
      answer_ques(go_pos++);
    if (go_pos == ques.size()) break;
    while (i < ques[go_pos].first.first) sweep(i++);
  }
}
void ansing() {
  for (int i = 0; i < m; i++) cout << ans[i] << '\n';
}
int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  input();
  map_it();
  calc();
  ansing();
}
