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

template<class T> ostream& operator << (ostream& os, const vector<T>& vec) {
    if(vec.empty()) return os;
    os << vec[0];
    for(auto it = vec.begin(); ++it != vec.end(); ) os << ' ' << *it;
    return os;
}

int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    int T;
    cin >> T;
    while(T--){
        ll n, x;
        cin >> n >> x;
        if(n * (n + 1) / 2 <= x){
            vector<ll> ans(n);
            iota(ans.begin(), ans.end(), 1);
            ans.back() = x - n * (n - 1) / 2;
            cout << ans << '\n';
        }else{
            cout << -1 << '\n';
        }
    }
}