//# pragma GCC target("avx")
# pragma GCC optimize("O3")
# pragma GCC optimize("unroll-loops")
#ifdef LOCAL
#define debug(x) cerr << #x << " = " << (x) << endl;
#else
#define debug(x) 
#endif
#include <bits/stdc++.h>
#include <optional> 
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#define fast ios::sync_with_stdio(false); cin.tie(nullptr); cout.tie(nullptr)
#define eb emplace_back
#define all(x) (x).begin(), (x).end()
using namespace std;
using ll = long long;
using namespace __gnu_pbds;
#include <atcoder/all>
using namespace atcoder;
constexpr ll inf = 2e18;
constexpr int mod = 998244353;

static void judge(bool c){
    cout << (c ? "Yes" : "No") << '\n';
}

int n,q,a[200000],l,r,x[200001];
int main() {
    cin >> n >> q;
    for(int i = 0; i < n; i++) {
        cin >> a[i];
        x[i + 1] = x[i] ^ a[i];
    }
    while(q--){
        cin >> l >> r;
        cout << (x[r] ^ x[l - 1]) << '\n';
    }
}