use proconio::input;

fn main(){
    input!{
        n: usize,
        q: usize,
        a: [i32; n],
        b: [(usize, usize); q],
    }

    let mut pre = Vec::<i32>::new();
    pre.push(0);
    for x in a{
        pre.push(pre.last().unwrap()^x);
    }

    for (l, r) in b{
        println!("{}", pre[r]^pre[l-1]);
    }
}