#include <iostream>
#include <vector>
using namespace std;
int main(){
    int n,q;cin>>n>>q;
    vector<int> A(n);
    vector<int> B(n+1);
    B[0] = 0;
    for(int i = 0; n > i; i++){
        cin>>A[i];
        B[i+1] = B[i]^A[i];
    }
    for(int i = 0; q > i; i++){
        int x,y;cin>>x>>y;
        cout << (B[x-1]^B[y]) << endl;
    }
}