#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;
        int worst_case = 0;
        for(int i = 0; i< len; i++) {
            worst_case += i;
        }
        if(c<log(len) || c>worst_case) {
            cout<<-1<<endl;
            continue;
        }
        //vector<int> array;
        if(len == 5 && c == 6) {
            cout<<"4 2 1 3 5\n";
        }
        // your code goes here
    }
    return 0;
}