#include<bits/stdc++.h>
using namespace std;
int main()
{
    long long int n,k,s,t;
    cin>>t;
    while(t--)
    {
        cin>>n>>k;
        if(n%2==0)
            s=(n/2)*(n-1);
        else
            s=((n-1)/2)*n;
        if(s==k)
        {
            cout<<1;
            for(long long i=2;i<=n;i++)
                cout<<' '<<i;
            cout<<endl;
            continue;
        }
        if(k<=n)
        {
            cout<<-1<<endl;
            continue;
        }
        if(k>s)
        {
            cout<<-1<<endl;
            continue;
        }
    }
}