#include <bits/stdc++.h>

using namespace std;

void fast_io() {
    ios::sync_with_stdio(false);
    std::cin.tie(nullptr);
}
void solve() {
    long long n, x;
    cin >> n >> x;
    if (n * (n + 1) / 2 > x) {
        cout << -1 << endl;
        return;
    }
    vector<long long> a(n);
    for (int i = 0; i < n - 1; i++) {
        a[i] = i + 1;
    }
    a[n - 1] = x - (n * (n - 1) / 2);
    for (int i = 0; i < n; i++) {
        cout << a[i] << (i == n - 1 ? "\n" : " ");
    }
}
int main() {
    fast_io();
    int t;
    cin >> t;
    while (t--) {
        solve();
    }
}