#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;
#define lli long long int


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */
    lli q;
    cin>>q;
     lli len,com;
    while(q--)
        {

       cin>>len>>com;
       if(len==1)
           cout<<"1"<<endl;

       else if(len%2==0)
            {
             lli a[len+1];
        for(lli i=len+1;i>=1;i--)
            {
            a[i]=i;
        }
            lli sum=0;
         for(lli i=len-1;i>=1;i--)
             sum=sum+i;

            if(sum==com)
               {
                        for(lli i=len;i>=1;i--)
            {
            cout<<a[i]<<" ";
        }
        
                cout<<endl;

            }
            else
                cout<<"-1"<<endl;




    }
        else
            {

            lli sum1=2;
            lli x=len-1;
            while(x!=2)
                {
                sum1=sum1+(x);
                x=x-2;

            }
            if(sum1==com)
                {
                lli wq[len+1];

                lli i=1;
                    wq[i]=len-1;
              //  cout<<"wq[i]= "<<wq[i]<<endl;
                 lli s=len-1-2;
                while(s !=0)
                    {
                    wq[++i]=s;
                  //  cout<<"wq[i+1]= "<<wq[i]<<endl;
                    s=s-2;

                }

                   wq[++i]=1;
                lli z=1;

                while(z!=len+2)
                    {
                    z=z+2;
                    wq[++i]=z;
                }



               for(lli i=1;i<=len;i++)
                   cout<<wq[i]<<" ";
                cout<<endl;



        }

            else
                cout<<"-1"<<endl;



    }
    }

    return 0;
}