use std::io;

fn main() {
    let t = read_line().parse::<usize>().unwrap();
    for _ in 0..t {
        let tokens = read_line().split_whitespace().map(|v| v.parse::<usize>().unwrap()).collect::<Vec<_>>();
        let n = tokens[0];
        let x = tokens[1];
        let sum = (1+n)*n/2;
        if x < sum {
            println!("{}", -1);
            continue;
        }

        let mut a = (1..=n).collect::<Vec<_>>();
        a[n-1] += x-sum;
        println!("{}", a.iter().map(|v| v.to_string()).collect::<Vec<_>>().join(" "));
    }
}

fn read_line() -> String {
    let mut line = String::new();
    io::stdin().read_line(&mut line).unwrap();
    line.trim_end().to_string()
}