#include <bits/stdc++.h>
#include <atcoder/all>
using namespace atcoder;
using namespace std;
using ll=long long;
using ld=long double;
ld pie=3.141592653589793;
ll mod=998244353;
ll inf=1009999999999999990;
int main(){
    ll n,q;
    cin >> n >> q;
    vector<ll>a(n);
    vector<ll>s(n);
    for (ll i = 0; i < n; i++)
    {
        cin >> a[i];
        if (i==0)
        {
            s[i]=a[i];
        }else{
            s[i]=s[i-1]^a[i];
        }
    }
    for (ll i = 0; i < q; i++)
    {
        ll l,r;
        cin >> l >> r;
        l--,r--;
        if (l==0)
        {
            cout << s[r] << endl;
        }else{
            ll x=s[l-1]^s[r];
            cout << x << endl;
        }
        
    }
    
}