#include <iostream>
#include <algorithm>
#include <map>
#include <set>
#include <queue>
#include <stack>
#include <numeric>
#include <bitset>
#include <cmath>

static const int MOD = 1000000007;
using ll = long long;
using u32 = unsigned;
using u64 = unsigned long long;
using namespace std;

template<class T> constexpr T INF = ::numeric_limits<T>::max() / 32 * 15 + 208;

int main() {
    int n, q;
    cin >> n >> q;
    vector<int> S(n+1);
    for (int i = 0; i < n; ++i) {
        int x; scanf("%d", &x);
        S[i+1] = S[i]^x;
    }
    for (int i = 0; i < q; ++i) {
        int l, r;
        scanf("%d %d", &l, &r);
        printf("%d\n", S[r]^S[l-1]);
    }
    return 0;
}