#include <bits/stdc++.h>

using namespace std;
using ll = long long;
using ld = long double;
template <class T = ll>
using vc = vector<T>;
template <class T = ll>
using vvc = vc<vc<T>>;
void solve();
int main() {
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    cout << fixed << setprecision(20);
    ll t = 1;
    cin >> t;
    for (int i = 1; i <= t; i++) solve();
    return 0;
}

void solve() {
    ll n, x;
    cin >> n >> x;
    if (n * (n + 1) / 2 > x) {
        cout << -1 << endl;
        return;
    }
    for (int i = 1; i < n; i++) {
        cout << i << " ";
        x -= i;
    }
    cout << x << endl;
}