#include <bits/stdc++.h>

using namespace std;
using ll = long long;

void solve(){
    ll N, X;
    cin >> N >> X;
    if (N*(N+1)/2 > X){
        cout << -1 << endl;
        return;
    }
    for (int i=1; i<N; i++) cout << i << " ", X -= i;
    cout << X << endl;
    return;
}

int main(){
    cin.tie(nullptr);
    ios_base::sync_with_stdio(false);

    int T;
    cin >> T;
    while(T){
        T--;
        solve();
    }

    return 0;
}