#include <bits/stdc++.h>
#include <atcoder/all>
using ll = long long;
#define MOD 1000000007
#define Mod 998244353
const int MAX = 1000000005;
const long long INF = 1000000000000000005LL;
using namespace std;
using namespace atcoder;



int main() {
    ios::sync_with_stdio(0);cin.tie();
    int T;
    cin >> T;
    while (T--) {
        int N;
        ll X;
        cin >> N >> X;
        ll mn = (ll)N*(N+1)/2;
        if (mn > X) {
            cout << -1 << endl;
            continue;
        }
        for (int i = 0; i < N; i++) {
            if (i == N-1) cout << X - (ll)N*(N-1)/2 << endl;
            else cout << i+1 << " ";
        }
    }
}