#include<bits/stdc++.h>
#include<atcoder/all>
#define chmin(x,y) (x) = min((x),(y))
#define chmax(x,y) (x) = max((x),(y))
#define ld long double
using namespace std;
using namespace atcoder;
using ll = long long;
const ll mod = 998244353;
using mint = modint998244353;
using Graph = vector<vector<int>>;
const vector<int> dx = {1,0,-1,0}, dy = {0,1,0,-1};

int main(){
  // input
  int t; cin >> t;
  while(t--){
    ll N,X; cin >> N >> X;
    vector<ll> ans(N);
    for(int i = 1; i < N; i++){
      ans[i-1] = i;
      X -= i;
    }
    ans[N-1] = X;
    if(ans[N-1] <= ans[N-2]) cout << -1 << endl;
    else{
      for(int i = 0; i < N; i++){
        if (i) cout << " ";
        cout << ans[i];
      } cout << endl;
    }
  }
}