T = int(input())
for _ in range(T):
    A, B = map(int, input().split())
    a = A
    Ans = []
    for b in range(60):
        if a>>b & 1:
            a_ = a + (1<<b)
            if a_ <= B:
                a = a_
                Ans.append(1<<b)
    for b in range(59, -1, -1):
        if a>>b & 1 == 0 and B>>b & 1:
            Ans.append(1<<b)
    print(len(Ans))
    print(" ".join(map(str, Ans)))