#include <bits/stdc++.h>
#include <bits/extc++.h>
using i64 = long long;
using i128 = __int128_t;
void solve()
{
    i64 n, x;
    std::cin >> n >> x;
    i64 check = (n - 1) * (n + 2) / 2;
    if (check >= x)
    {
        std::cout << "-1\n";
        return;
    }
    i64 S = n * (n - 1) / 2;
    i64 r = x - S;
    for (int i = 1; i <= n - 1; i++)
    {
        std::cout << i << ' ';
    }
    std::cout << r << '\n';
}
int main()
{
    std::cin.tie(nullptr)->sync_with_stdio(false);
    int t;
    std::cin >> t;
    while (t--)
    {
        solve();
    }
    return 0;
}