import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        
        int T = sc.nextInt();
        
        for (int i = 0; i < T; i++) {
            long N = sc.nextLong();
            long X = sc.nextLong();
            solve(N, X);
        }
    }
    
    static void solve(long N, long X) {
        if (X < N * (N+1) / 2) {
            System.out.println(-1);
            return;
        }
        
        for (int i = 1; i <= N-1; i++) System.out.print(i + " ");
        System.out.println(X - (N * (N-1) / 2));
    }
}