#include <bits/stdc++.h>

int ri() {
    int n;
    scanf("%d", &n);
    return n;
}

int main() {
    int n = ri();
    int q = ri();
    int a[n + 1];
    a[0] = 0;
    for (int i = 0; i < n; i++) a[i + 1] = a[i] ^ ri();
    for (int i = 0; i < q; i++) {
        int l = ri() - 1;
        int r = ri();
        printf("%d\n", a[r] ^ a[l]);
    }
    return 0;
}