C

#include <bits/stdc++.h>
using namespace std;

int main()
{
    int t;
    cin>>t;

    while(t--)
    {
        int n, x;
        cin>>n>>x;

        if(x>=n-1 && !(x==0 && n==1))
        {
           cout<<-1<<"\n";
           continue;
        }

        for(int i=n; i>x+1; i--)
            cout<<i<<" ";

        for(int i=1; i<=x+1; i++)
            cout<<i<<" ";
        cout<<"\n";
    }
}