T = int(input())
for i in range(T):
    A, B = map(int, input().split())
    a, b = A, B
    res = []
    p = 0
    while a!=b:
        if a&1:
            res.append(1<<p)
            a += 1
        p += 1
        a //= 2
        b //= 2
    A += sum(res)
    p2 = 1<<60
    while A!=B:
        if A+p2<=B:
            A += p2
            res.append(p2)
        p2 //= 2
    print(len(res))
    print(*res)