/*Gaurav Chauhan*/
#include <bits/stdc++.h>
typedef long long ll;
#define sz(a) int((a).size()) 
#define pb push_back 
#define all(c) (c).begin(),(c).end() 
using namespace std;
int main()
{	int tc,i,j,k,x,y;
	cin>>tc;
	while(tc--){
		cin>>x>>y;
        if(y>2*x)
         {
            cout<<-1<<endl;
            continue;
            
        }
		int a[x+1];
		//if(y<x-1){
			a[1]=y+1;
			k=1;
			cout<<a[1]<<" ";
			for(i=2;i<=x;i++)
			{
				if(x==k)
					k++;
				a[i]=k;
				k++;
				cout<<a[i]<<" ";
			}
        cout<<endl;
		//}
	}
	return 0;
}