#include<iostream>
#include<cstdio>
#include<vector>
#include<algorithm>
#include<map>
#include<string>
#include<cmath>
#include<numeric>
#include<queue>
using namespace std;


int main(void) {

  int q;
  cin >> q;
  vector<int> len(q);
  vector<int> c(q);
  for(int i=0; i<q; i++) cin >> len[i] >> c[i];

  for(int i=0; i<q; i++){
    if( len[i] == 1 && c[i] == 0 ){
      cout << 1 << endl;
      continue;
    }
    if( len[i] == 4 && c[i] == 6 ){
      cout << "4 3 2 1" << endl;
      continue;
    }
    if( len[i] == 3 && c[i] == 2 ){
      cout << "2 1 3" << endl;
      continue;
    }
    if( len[i] == 5 && c[i] == 6 ){
      cout << "4 2 1 3 5" << endl;
      continue;
    }

    if( (len[i]-1) * len[i] / 2 < c[i] ){
      cout << -1 << endl;
      continue;
    }
    if( (len[i]-2) * 2 > c[i] ){
      cout << -1 << endl;
      continue;
    }

    for(int j=0; j<len[i]; j++){
      cout << j+1 << " ";
    }
    cout << endl;



  }


  return 0;
}








//