#include<bits/stdc++.h>
using namespace std ;
#define ll long long
#define  pb push_back
#define  mp make_pair
int main()
{
	int t ,i;
	cin>>t;
	while(t--)
	{
		 int n ,c ;
		 cin>>n>>c;
		    int tc =n*(n-1)/2;
		    if(tc>c)
		      cout<<"-1"<<endl ;
		     else if(tc==n-1)
		        {
		        	for(i=1;i<=n;i++)
                          cout<<i<<" ";
				}
		     else if(tc==c)
			     {
			     	for(i=n;i>=1;i--)
			     	        cout<<i<<" ";
						 }		
		    cout<<endl ;        

	}
	return 0;
}