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

#ifdef LOCAL
#include <debug.hpp>
#else
#define debug(...)
#endif

void solve() {
    int N;
    ll X;
    cin >> N >> X;
    ll sum = 0;
    vector<ll> A(N);
    for (int i = 0; i < N; i++) {
        A[i] = i + 1;
        sum += i + 1;
    }
    if (sum > X) {
        cout << -1 << '\n';
        return;
    }
    A.back() += X - sum;
    for (int i = 0; i < N; i++) {
        cout << A[i] << " \n"[i + 1 == N];
    }
}

int main() {
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    cout << fixed << setprecision(20);
    int T;
    cin >> T;
    while (T--) solve();
}