import java.util.*;
import static java.lang.System.*;

public class Main {

	public static void main(String[] args) {
		try (Scanner sc = new Scanner(in)) {
			int T = sc.nextInt();
			while(T --> 0) {
				long A = sc.nextLong(), B = sc.nextLong();
				ArrayList<Long> ans = new ArrayList<>();
				while(B > A) {
					for (int i = 60;i >= 0;-- i) {
						if (B - A >= 1L << i && A % (1L << i) == 0) {
							ans.add(1L << i);
							A += 1L << i;
							i = 60;
						}
					}
				}
				out.println(ans.size());
				for (int i = 0;i < ans.size();++ i) {
					if (i != 0) out.print(" ");
					out.print(ans.get(i));
				}
				out.println();
			}
		}
	}

}