fn main() {
    let t = input_value();

    for _ in 0..t {
        let (n, x) = input_tuple();

        let mut total = 0_usize;

        for i in 1..=n {
            total += i;
        }

        if total > x {
            println!("-1");
            continue;
        }

        let mut list: Vec<_> = (1..=n).collect();

        list[n - 1] += x - total;

        let text = list
            .iter()
            .map(|x| x.to_string())
            .collect::<Vec<_>>()
            .join(" ");

        println!("{}", text);
    }
}

fn input_value<T>() -> T
where
    T: std::str::FromStr,
    <T as std::str::FromStr>::Err: std::fmt::Debug,
{
    let stdin = std::io::stdin();

    let mut buf = String::new();
    stdin.read_line(&mut buf).unwrap();
    buf = buf.trim_end().to_owned();

    let n = buf.parse().unwrap();

    n
}

fn input_tuple<T>() -> (T, T)
where
    T: std::str::FromStr,
    <T as std::str::FromStr>::Err: std::fmt::Debug,
{
    let stdin = std::io::stdin();

    let mut buf = String::new();
    stdin.read_line(&mut buf).unwrap();
    buf = buf.trim_end().to_owned();

    let mut iter = buf.split_whitespace();

    let n = iter.next().unwrap().parse().unwrap();
    let m = iter.next().unwrap().parse().unwrap();

    (n, m)
}