#include<bits/stdc++.h>
using namespace std;
using ll=long long;
ll T,N,X;
int main()
{
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    cin>>T;
    for(;T--;)
    {
        cin>>N>>X;
        if(X<N*(N+1)/2)cout << -1 << endl;
        else
        {
            for(int i=0;i<N;i++)
            {
                if(i<N-1)
                {
                    cout << i+1 << " ";
                    X-=i+1;
                }
                else cout << X << endl;;
            }
        }
    }
}