macro_rules! input {
    ($($r:tt)*) => {
        let stdin = std::io::stdin();
        let mut bytes = std::io::Read::bytes(std::io::BufReader::new(stdin.lock()));
        let mut next = move || -> String{
            bytes.by_ref().map(|r|r.unwrap() as char)
                .skip_while(|c|c.is_whitespace())
                .take_while(|c|!c.is_whitespace())
                .collect()
        };
        input_inner!{next, $($r)*}
    };
}

macro_rules! input_inner {
    ($next:expr) => {};
    ($next:expr,) => {};
    ($next:expr, $var:ident : $t:tt $($r:tt)*) => {
        let $var = read_value!($next, $t);
        input_inner!{$next $($r)*}
    };
}

macro_rules! read_value {
    ($next:expr, ( $($t:tt),* )) => { ($(read_value!($next, $t)),*) };
    ($next:expr, [ $t:tt ; $len:expr ]) => {
        (0..$len).map(|_| read_value!($next, $t)).collect::<Vec<_>>()
    };
    ($next:expr, $t:ty) => ($next().parse::<$t>().expect("Parse error"));
}

fn main() {
    input! {
        t: usize,
        query: [(usize, usize); t],
    }

    for i in 0..t {
        let (n, x) = query[i];

        if (1..=n).sum::<usize>() > x {
            println!("-1");
            continue;
        }

        let mut ans = (1..=n).collect::<Vec<usize>>();
        let diff = x - ans.iter().sum::<usize>();
        ans[n - 1] += diff;

        let line = ans
            .iter()
            .map(|&x| x.to_string())
            .collect::<Vec<String>>()
            .join(" ");
        println!("{}", line);
    }
}