#include <bits/stdc++.h>

using namespace std;

int main()
{
    int t;
    cin>>t;
    while(t--)
        {
        int n,c;
        cin>>n>>c;
        if(c>n+2)
           { cout<<"-1";
            cout<<"\n";
           }
        else
            {
        if(n%2==0)
            {
            for(int i=n;i>=1;i--)
                cout<<i<<" ";
            cout<<"\n";
        }
        else
            {
            vector<int> a;
            vector<int> b;
            for(int i=1;i<=n;i++)
                {
                if(i%2==0)
                    a.push_back(i);
                    else
                    b.push_back(i);
            }
            
            for(int i=a.size()-1;i>=0;i--)
                cout<<a[i]<<" ";
            for(int i=0;i<b.size();i++)
                cout<<b[i]<<" ";
            
           cout<<"\n"; 
        }
        
    }
    }
   
   
    return 0;
}