#include <bits/stdc++.h>

using namespace std;

int main(){
    int q;
    cin >> q;
    for(int a0 = 0; a0 < q; a0++){
        int len;
        int c;
        cin >> len >> c; // length of array and comparisons
        if (c > (len)*(len - 1)/2){
            cout << -1 << endl ;
        }
        else if (c == (len)*(len - 1)/2){
            for (int i = 0 ; i < len ; i++){
                cout << len - i << " ";
            }
            cout << "\n" ;
        }
        else if (c < len-1){
            cout << -1 << endl ;
        }
        else {
           for (int i = 0 ; i < len ; i++){
                cout << len - i << " ";
            }
             cout << "\n" ;
            
        }
    }
    
    return 0;
}