#include <bits/stdc++.h>
using namespace std;
int main() {
  int T;
  cin >> T;
  while (T--) {
    int N;
    cin >> N;
    long long X;
    cin >> X;
    if (N == 1) {
      cout << X << endl;
      continue;
    }
    vector<long long> A(N);
    long long sum = 0;
    for (int i = 0; i < N - 1; i++) {
      A[i] = i + 1;
      sum += A[i];
    }
    A[N - 1] = X - sum;
    if (A[N - 2] < A[N - 1]) {
      for (int i = 0; i < N; i++) {
        cout << A[i] << " \n"[i == N - 1];
      }
    } else {
      cout << -1 << endl;
    }
  }
  return 0;
}