#include <bits/stdc++.h>
using namespace std;
#ifdef LOCAL
  #include "settings/debug.cpp"
  #define _GLIBCXX_DEBUG
#else
  #define Debug(...) void(0)
#endif
using ll = long long;
#define rep(i, n) for (int i = 0; i < (n); ++i)

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 << " ";
  ll a = x - n * (n - 1) / 2;
  cout << a << endl;
}

int main() {
  int t;cin>>t;
  while(t--) solve();
  return 0;
}