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

int main() {
    cin>>n;
    for(int i=0;i<n;i++)
    {
        int a,b;
        cin>>a>>b;
        if(b==0)
            {for(int j=1;j<=a;j++)
               cout<<j<<" ";
            cout<<"\n";}
        else
            cout<<"-1\n";
    }
    return 0;
}