#include<bits/stdc++.h>
using namespace std;
using ll = long long;
#define rep(i,m,n) for(int i=m; i<n; ++i)
#define repl(i,m,n) for(ll i=m; i<n; ++i)
#define all(a) (a).begin(), (a).end()
#define rall(a) (a).rbegin(), (a).rend()

int main(){
    int N, Q;
    cin >> N >> Q;
    vector<int> A(N), l(Q), r(Q);
    rep(i, 0, N) cin >> A[i];
    rep(i, 0, Q) cin >> l[i] >> r[i];

    vector<int> S(N+1);
    rep(i, 0, N) S[i+1] = S[i] ^ A[i];

    rep(i, 0, Q){
        int ans = S[r[i]] - S[l[i]-1];
        cout << ans << endl;
    }

    return 0;
}