import java.util.*;
import java.io.*;
class Main{
	private static final BufferedReader br =
		new BufferedReader(new InputStreamReader(System.in));
	private static final PrintWriter out =
		new PrintWriter(System.out);
	public static void main(String[] args)throws IOException{

		int T = Integer.parseInt(br.readLine());
		while(T-->0){
			String[] str = br.readLine().split(" ");
			int N = Integer.parseInt(str[0]);
			long X = Long.parseLong(str[1]);
			if(X<(long)N*(N+1)/2)
				out.println(-1);
			else{
				for(int i=1;i<N;i++){
					out.print(i);
					out.print(" ");
				}
				out.println(X-(long)N*(N-1)/2);
			}
		}

		br.close();
		out.close();
	}
}