T = int(input())

for _ in range(T):
    A, B = map(int, input().split())

    for i in range(60)[::-1]:
        if (B >> i) & 1:
            if (A >> i) & 1:
                B &= ~(1 << i)
                A &= ~(1 << i)
                continue
            target = 1 << i
            break

    X = []
    while A and A < target:
        i = A & -A
        X.append(i)
        A += i
    if A < target:
        X.append(target)
        A = target

    Y = []
    while B > A:
        i = B & -B
        Y.append(i)
        B -= i

    ans = X + Y[::-1]
    print(len(ans))
    print(*ans)