import java.io.*;
import java.util.*;
import java.util.function.*;
import java.util.stream.*;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner();
        int t = sc.nextInt();
        String result = IntStream.range(0, t).mapToObj(r -> {
            long a = sc.nextLong();
            long b = sc.nextLong();
            List<Long> ans = new ArrayList<>();
            for (int i = 0; i < 60; i++) {
                long current = (1L << i);
                if ((a & current) > 0 && a + current <= b) {
                    a += current;
                    ans.add(current);
                }
            }
            for (int i = 59; i >= 0; i--) {
                long current = (1L << i);
                if ((a & current) == 0 && a + current <= b) {
                    a += current;
                    ans.add(current);
                }
            }
            return ans.size() + "\n" + ans.stream()
                .map(x -> x.toString()).collect(Collectors.joining(" "));
        }).collect(Collectors.joining("\n"));
        System.out.println(result);
    }
}
class Scanner {
    BufferedReader br;
    StringTokenizer st = new StringTokenizer("");
    StringBuilder sb = new StringBuilder();
    
    public Scanner() {
        try {
            br = new BufferedReader(new InputStreamReader(System.in));
        } catch (Exception e) {
            
        }
    }
    
    public int nextInt() {
        return Integer.parseInt(next());
    }
    
    public long nextLong() {
        return Long.parseLong(next());
    }
    
    public double nextDouble() {
        return Double.parseDouble(next());
    }
    
    public String next() {
        try {
            while (!st.hasMoreTokens()) {
                st = new StringTokenizer(br.readLine());
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            return st.nextToken();
        }
    }
    
}