fn main() {
    let mut nq = String::new();
    std::io::stdin().read_line(&mut nq).ok();
    let nq: Vec<usize> = nq.trim().split_whitespace().map(|s| s.parse().unwrap()).collect();
    let n = nq[0];
    let q = nq[1];
    let mut a = String::new();
    std::io::stdin().read_line(&mut a).ok();
    let mut summary: Vec<usize> = vec![0; n+1];
    a.trim().split_whitespace().map(|s| s.parse::<usize>().unwrap()).enumerate().for_each(|pair| {
        summary[pair.0 + 1] = summary[pair.0] ^ pair.1;
    });
    for _ in 0..q {
        let mut lr = String::new();
        std::io::stdin().read_line(&mut lr).ok();
        let lr: Vec<usize> = lr.trim().split_whitespace().map(|s| s.parse().unwrap()).collect();
        let l = lr[0];
        let r = lr[1];
        println!("{}", summary[r] ^ summary[l-1]);
    }
}