#include <bits/stdc++.h>
#define PB push_back
#define MP make_pair
#define REP(i, n) for (int i = 0; i < (n); ++i)
#define FOR(i, n, m) for (int i = (n); i < (m); ++i)
#define ALL(a) (a).begin(), (a).end()
#define RALL(a) (a).rbegin(), (a).rend()
using namespace std;
using ll = long long;
using vi = vector<int>;
using vll = vector<ll>;
using vvi = vector<vi>;
using vvll = vector<vll>;
using vs = vector<string>;
using pii = pair<int, int>;
using Graph = vector<vector<int>>;


void solve(){
  ll N, X; cin >> N >> X;
  vll A(N);
  REP(i, N-1) A[i] = i+1;
  A[N-1] = X - (1+N-1)*(N-1)/2;
  if(A[N-2]<A[N-1]){
    REP(i, N){
      if(i) cout << " ";
      cout << A[i];
    }
    cout << endl;
  }
  else cout << -1 << endl;
}


int main() {
  ll T; cin >> T;
  REP(_, T) solve();
}