#include <bits/stdc++.h>
#define rep(i, a, n) for(int i = a; i < n; i++)
using namespace std;
using ll = long long;
using P = pair<int, int>;

int main()
{
    int n, q;
    cin >> n >> q;
    vector<int> a(n);
    rep(i, 0, n) cin >> a[i];
    vector<int> sum(n);
    sum[0] = a[0];
    rep(i, 0, n-1){
        sum[i+1] = sum[i]^a[i+1];
    }
    vector<int> ans;
    rep(i, 0, q){
        int l, r;
        cin >> l >> r;
        l--; r--;
        ans.push_back(sum[r]^sum[l-1]);
    }
    for(int i : ans){
        cout << i << endl;
    }
    return 0;
}