#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;

inline long fact(int n)
    {
        long int mul=0;
        for(int i=n;i>0;i--)
            {
                mul=mul+i;
            }
        return mul;
    }


int main() {
    int q;
    long int c,f1=0,f2=0;
    int k,j;
    int len;
    long int sum=0;
    cin>>q;
    for(int i=0;i<q;i++)
        {
            cin>>len>>c;
            if(c>fact(len-1))
            {
                cout<<"-1"<<endl;
                continue;
            }
            else if(len==1)
                {
                    cout<<"1"<<endl;
                    continue;
                }
            c=c-(len-1);
            if(c==0)
                {
                    int z=len/2+1;
                    cout<<z<<" ";
                    for(int i=1;i<=len;i++)
                        {
                            if(i==z)
                                continue;
                        cout<<i<<" ";
                        }
                    cout<<endl;
                    continue;
            }
            for(j=0;f1+f2<=c;j++)
                {
                for(k=0;f1+f2<=c;k++)
                    {
                        f1=fact(k);f2=fact(j);
                        if(f1+f2==c)
                            break;
                    }
                        if(f1+f2==c)
                            break;
                }
            //j++;k++;
            if(j==0)
                {
                    for(int k=len;k>0;k--)
                        cout<<k<<" ";
                    cout<<endl;
                }
            else
                {
                    for(int k=len-j;k>0;k--)
                        cout<<k<<" ";
                    for(k=len-j+1;k<=len;k++)
                        cout<<k<<" ";
                    cout<<endl;
                }
            
            
        }
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    return 0;
}