import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.util.StringTokenizer;

public class LenaSort {
	public static void main(String[] args) {
		InputStream inputStream = System.in;
		OutputStream outputStream = System.out;
		InputReader in = new InputReader(inputStream);
		PrintWriter out = new PrintWriter(outputStream);
		TaskA solver = new TaskA();
		solver.solve(in, out);
		out.close();
	}

	static class TaskA {
		public void solve(InputReader in, PrintWriter out) {
			int Q = in.nextInt();
			for(int t = 0; t < Q; t++) {
				int len = in.nextInt();
				long c = in.nextInt();
				int max = (len - 1) * len/2;
				
				if(c > max) {
					out.println(-1);
				} else {
					if(c == max) {
						for(int i = len; i > 0; i-- ) {
							out.print(i + " ");
						}
						out.println();
					} else if( c == ((max/2)+1)) {
						int mid = 0;
						if(len%2== 0) mid = len/2;
						else mid = (len/2) + 1;
						StringBuilder st = new StringBuilder();
						st.append(mid + " ");
						for(int i = 1; i < mid; i++) {
							st.append(i+" ");
						}
						for(int i = mid+1; i <= len; i++) {
							st.append(i+" ");
						}
                        out.println(st);
					} 
					
				}
			}

		
			
		}
	}

	static class InputReader {
		public BufferedReader reader;
		public StringTokenizer tokenizer;

		public InputReader(InputStream stream) {
			reader = new BufferedReader(new InputStreamReader(stream), 32768);
			tokenizer = null;
		}

		public String next() {
			while (tokenizer == null || !tokenizer.hasMoreTokens()) {
				try {
					tokenizer = new StringTokenizer(reader.readLine());
				} catch (IOException e) {
					throw new RuntimeException(e);
				}
			}
			return tokenizer.nextToken();
		}

		public int nextInt() {
			return Integer.parseInt(next());
		}
		
		public long nextLong() {
			return Long.parseLong(next());
		}

	}
}