#include <bits/stdc++.h>

using namespace std;

void shiftleft(int myarray[], int size)
{
  
int temp = myarray[0];
for (int i=0; i< size - 2; i++)
{
        myarray[i] = myarray[i+1];
       
}
   myarray[size-1] = temp;
}

int main(){
    int q;
    cin >> q;
    
    for(int a0 = 0; a0 < q; a0++){
        int len;
        int c;
        cin >> len >> c;
        // your code goes here
        
        if(len==1)
        { cout << '1' ; return 0 ;}
        
        if(c > (len*len - len)/2 || c < 2*len - 4 )
            { 
             printf("-1"); 
             return 0 ;
             }
        
        int arr[len];
        
        for(int i = 0 ; i < len ; i++ )
           { arr[i] = len - i ;
            cout << arr[i] ;
           }        
        
         int comp = (len*(len-1))/2;
         int aa = 0 ;
         int b;
        
        while(comp != q)
        {
           shiftleft(arr , len);
           comp--; 
        }
        
        
        for(int j = 0;j< len ; j++)
         {
            cout << arr[j]<< ' ' ;
        }
        cout << endl;
    }
    
    return 0;
}