t = int(input())
for _ in range(t):
    a, b = map(int, input().split())
    ans = []
    
    len_b = len(bin(b)) - 2
    len_a = len(bin(a)) - 2
    for i in range(100)[::-1]:
        if a & (1 << i) != b & (1 << i):
            len_b = i + 1
            break

    for i in range(len_b - 1):
        if a & (1 << i):
            a += 1 << i
            ans.append(1 << i)
    for i in range(len_b)[::-1]:
        if a & (1 << i) != b & (1 << i):
            a += (1 << i)
            ans.append(1 << i)
    print(len(ans))
    print(*ans)