#include <bits/stdc++.h>
using namespace std;
#ifdef LOCAL
  #include "settings/debug.cpp"
#else
  #define Debug(...) void(0)
#endif
#define rep(i, n) for (int i = 0; i < (n); ++i)
using ll = long long;
using ull = unsigned long long;

int main() {
  cin.tie(nullptr)->sync_with_stdio(false);
  int n, q;
  cin >> n >> q;
  vector<int> a(n);
  rep(i, n) cin >> a[i];
  vector<int> sum(n + 1);
  rep(i, n) sum[i + 1] = sum[i] ^ a[i];
  while (q--) {
    int l, r;
    cin >> l >> r;
    --l;
    cout << (sum[r] ^ sum[l]) << '\n';
  }
  return 0;
}