#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;
        if (c > (len * (len - 1))/2)
            cout << -1 ;
        else {
            int step = len ;
            int cur_c = c;
            int no = 0;
            while (cur_c > 0) {
                step --;
                no ++;
                cur_c -= step;
            }
            cur_c += step;
            vector<int> v;
            if (cur_c > 4) 
                cout << -1;
            if(cur_c == 2) {
                
            }
            for (int i = len; i > len - no ; i--) {
                v.push_back(i);
            }
            for (int i = 0; i < len - no + 1; i++) {
                v.push_back(i + 1);
            }
            for (int i = 0; i < len; i++) {
                cout << v[i] << " ";
            }
        }
        cout << endl;
        // your code goes here
    }
    return 0;
}