#include<iostream>
#include<vector>
#include<algorithm>
#include<cmath>
using namespace std;

int main() {
    int t;
    cin >> t;
    for (int i = 0; i < t; i++) {
        long long n, x;
        cin >> n >> x;
        long long d = x - n * (n + 1) / 2;
        if (d >= 0) {
            for (int j = 1; j <= n - 1; j++) cout << j << " ";
            cout << n + d << endl;
        }
        else cout << -1 << endl;
    }
}