t = int(input())
for _ in range(t):
    a, b = map(int, input().split())
    l, r = [], []
    cnt = 0
    while a < b:
        if a % 2:
            l.append(pow(2, cnt))
            a += 1
        if b % 2:
            r.append(pow(2, cnt))
            b -= 1
        a //= 2
        b //= 2
        cnt += 1
    print(len(l) + len(r))
    print(*(l + r[::-1]))