#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define rep(i, s, e) for (int i = (int)(s); i < (int)(e); ++i)
#define all(a) (a).begin(),(a).end()

int main() {
    cin.tie(nullptr);
    ios_base::sync_with_stdio(false);
    
    int T;
    cin >> T;
    
    rep(testcase, 0, T) {
        ll N, X;
        cin >> N >> X;
        
        ll t = N*(N + 1) / 2;
        if (X < t) {
            cout << -1 << '\n';
            continue;
        }
        
        rep(i, 0, N - 1) cout << i + 1 << ' ';
        cout << X - N*(N - 1) / 2 << '\n';
    }
}