#include <bits/stdc++.h>
using namespace std;

#define rep(i, n) for( int i = 0; i < n; i++ )
using ll = long long;

int main() {
	int T;
	cin >> T;
	rep(i, T) {
		ll N, X;
		cin >> N >> X;
		ll s = N * (N - 1) / 2;
		if(X - s < N) cout << -1 << endl;
		else {
			rep(j, N - 1) cout << j + 1 << " ";
			cout << X - s <<endl;
		}
	}
}