#include <bits/stdc++.h>

using namespace std;

int main(){
    int q;
    cin >> q;
    for(int a0 = 0; a0 < q; a0++){
        int len;
        int c,i;
        cin >> len >> c;
            if(c>(len*(len-1))/2)
                cout << -1 << endl;
            else if(c==(len*(len-1))/2)
                {
                    for(i=len;i>0;i--)
                        cout << i << " ";
                cout << endl;
                }
    }

    return 0;
}