#include <bits/stdc++.h>
using namespace std;

int main()
{
	int N, Q;
	cin >> N >> Q;
	vector<int> a( N );
	for( int i = 0; i < N; i++ ) {
		cin >> a[i];
	}

	vector<int> acc( N + 1 );
	for( int i = 0; i < N; i++ ) {
		acc[i + 1] = acc[i] ^ a[i];
	}

	for( int i = 0; i < Q; i++ ) {
		int l, r;
		cin >> l >> r;
		int ans = acc[r] ^ acc[l - 1];
		cout << ans << endl;
	}
}