#include <bits/stdc++.h>
using namespace std;

int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);

    int test; cin >> test;
    while(test--){
        long long N,X; cin >> N >> X;
        vector<long long> answer;
        bool ok = true;
        for(int i=0; i<N; i++){
            if(i == N-1){
                answer.push_back(X);
                if(X < N) ok = false;
            }
            else{
                answer.push_back(i+1);
                X -= i+1;
            }
        }
        if(ok){
            for(int i=0; i<N; i++){
                if(i) cout << " ";
                cout << answer.at(i);
            }
            cout << endl;
        }
        else cout << -1 << endl;
    }
}