fn main() {
    let t = {
        let mut line = String::new();
        std::io::stdin().read_line(&mut line).unwrap();
        line.trim().parse::<usize>().unwrap()
    };

    for _ in 0..t {
        match solve() {
            Some(ans) => {
                print!("{}", ans[0]);
                for e in ans[1..].iter() {
                    print!(" {}", e);
                }
                println!();
            }
            None => println!("-1"),
        }
    }
}

fn solve() -> Option<Vec<usize>> {
    let (n, x) = {
        let mut line = String::new();
        std::io::stdin().read_line(&mut line).unwrap();
        let mut iter = line.split_whitespace();
        (
            iter.next().unwrap().parse::<usize>().unwrap(),
            iter.next().unwrap().parse::<usize>().unwrap(),
        )
    };

    if n * (n + 1) / 2 > x {
        return None;
    }

    let mut seq = (1..=n).collect::<Vec<usize>>();
    seq[n - 1] += x - n * (n + 1) / 2;

    Some(seq)
}