import java.io.*;
import java.util.*;
 



 class Main
{
     static int count;
      static String lena_sort(String nums) {
    if (nums.length() == 1) {
        return ""+nums.charAt(0);
    }
    if(nums.length()<1){
        return "";
    }
    char pivot = nums.charAt(0);
    StringBuffer less=new StringBuffer("");
    StringBuffer more=new StringBuffer("");
    
    
    int i;
    for ( i = 1; i < nums.length() && count>0; ++i) {
    	// Comparison
        if (nums.charAt(i) > pivot) {
            less.append(nums.charAt(i));
            count--;
        }
        else {
            more.append(nums.charAt(i));
            count--;
        }
    }
    String sorted_less = lena_sort(less.toString());
    String sorted_more = lena_sort(more.toString());
    String ans = sorted_less + pivot + sorted_more;
    
    for(;i<nums.length();i++){
        ans=ans+nums.charAt(i);
    }
    return ans;
}
   
	public static void main(String args[]) throws Exception
	{
		InputReader sc=new InputReader(System.in);		
		PrintWriter pw=new PrintWriter(System.out);
      
            int q=sc.nextInt();
            
            while(q>0){
                int n=sc.nextInt();
                int c=sc.nextInt();
                count=c;
                if(c<n-1 || c> n*(n-1)/2){
                    System.out.println("-1");
                }else{
                String s="";
                for(int i=1;i<=n;i++){
                    s=s+i;
                }
                
                String res=lena_sort(s);
                for(int i=0;i<res.length();i++){
                    System.out.print(res.charAt(i)+" ");
                }
                }
                System.out.println("");
                q--;
            }
                
                
                
                 }
 }
	 class InputReader
	{
		private InputStream stream;
		private byte[] buf = new byte[1024];
		private int curChar;
		private int numChars;
		private SpaceCharFilter filter;
		
		public InputReader(InputStream stream)
		{
			this.stream = stream;
		}
		
		public int read()
		{
			if (numChars==-1) 
				throw new InputMismatchException();
			
			if (curChar >= numChars)
			{
				curChar = 0;
				try 
				{
					numChars = stream.read(buf);
				}
				catch (IOException e)
				{
					throw new InputMismatchException();
				}
				
				if(numChars <= 0)				
					return -1;
			}
			return buf[curChar++];
		}
	 
		public String nextLine()
		{
			BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
			String str = "";
            try
            {
                str = br.readLine();
            }
            catch (IOException e)
            {
                e.printStackTrace();
            }
            return str;
		}
		public int nextInt()
		{
			int c = read();
			
			while(isSpaceChar(c)) 
				c = read();
			
			int sgn = 1;
			
			if (c == '-') 
			{
				sgn = -1;
				c = read();
			}
			
			int res = 0;
			do 
			{
				if(c<'0'||c>'9') 
					throw new InputMismatchException();
				res *= 10;
				res += c - '0';
				c = read();
			}
			while (!isSpaceChar(c)); 
			
			return res * sgn;
		}
		
		public long nextLong() 
		{
			int c = read();
			while (isSpaceChar(c))
				c = read();
			int sgn = 1;
			if (c == '-') 
			{
				sgn = -1;
				c = read();
			}
			long res = 0;
			
			do 
			{
				if (c < '0' || c > '9')
					throw new InputMismatchException();
				res *= 10;
				res += c - '0';
				c = read();
			}
			while (!isSpaceChar(c));
				return res * sgn;
		}
		
		public double nextDouble() 
		{
			int c = read();
			while (isSpaceChar(c))
				c = read();
			int sgn = 1;
			if (c == '-') 
			{
				sgn = -1;
				c = read();
			}
			double res = 0;
			while (!isSpaceChar(c) && c != '.') 
			{
				if (c == 'e' || c == 'E')
					return res * Math.pow(10, nextInt());
				if (c < '0' || c > '9')
					throw new InputMismatchException();
				res *= 10;
				res += c - '0';
				c = read();
			}
			if (c == '.') 
			{
				c = read();
				double m = 1;
				while (!isSpaceChar(c)) 
				{
					if (c == 'e' || c == 'E')
						return res * Math.pow(10, nextInt());
					if (c < '0' || c > '9')
						throw new InputMismatchException();
					m /= 10;
					res += (c - '0') * m;
					c = read();
				}
			}
			return res * sgn;
		}
		
		public String readString() 
		{
			int c = read();
			while (isSpaceChar(c))
				c = read();
			StringBuilder res = new StringBuilder();
			do 
			{
				res.appendCodePoint(c);
				c = read();
			} 
			while (!isSpaceChar(c));
			
			return res.toString();
		}
	 
		public boolean isSpaceChar(int c) 
		{
			if (filter != null)
				return filter.isSpaceChar(c);
			return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
		}
	 
		public String next() 
		{
			return readString();
		}
		
		public interface SpaceCharFilter 
		{
			public boolean isSpaceChar(int ch);
		}
	}