mod = 1000000007
eps = 10**-9


def main():
    import sys
    input = sys.stdin.readline

    for _ in range(int(input())):
        A, B = map(int, input().split())
        NB = B.bit_length()
        i0 = NB - 1
        ans = []
        while A >> i0 & 1 == B >> i0 & 1:
            i0 -= 1
        A %= 1 << i0
        if A == 0:
            ans.append(1)
            A = 1
        while A < (1 << i0):
            ans.append(A & -A)
            A += A & -A
        for i in range(i0-1, -1, -1):
            if A >> i & 1 != B >> i & 1:
                ans.append(1 << i)
        print(len(ans))
        print(*ans)


if __name__ == '__main__':
    main()