#include <bits/stdc++.h>
using namespace std;
int main() {
    int t;
    cin >> t;
    while (t--) {
        int N, X;
        cin >> N >> X;
        long mi = N * (N + 1) / 2;
        if (X < mi) {
            cout << -1 << endl;
        } else {
            for (int i = 0; i < N - 1; i++) {
                cout << i + 1 << " ";
            }
            cout << X - (mi - N) << endl;
        }
    }
}