#include <bits/stdc++.h>
#if __has_include("./debug.cpp")
#include "./debug.cpp"
#else
#define debug(...)
#define print_line
#endif
using namespace std;
using ll = long long;

void solve() {
	int N;
	ll X;
	cin >> N >> X;
	if (X < 1ll * N * (N + 1) / 2) {
		cout << "-1\n";
		return;
	}

	vector<ll> ans;
	for (int i = 0; i < N - 1; i++) ans.push_back(i + 1);
	ans.push_back(X - 1ll * (N - 1) * N / 2);
	for (int i = 0; i < N; i++) cout << ans[i] << ' ';
	cout << '\n';
}

int main() {
	int T;
	cin >> T;
	for (int i = 0; i < T; i++) {
		solve();
	}
}