import sys
input = sys.stdin.buffer.readline
sys.setrecursionlimit(10 ** 7)


def calc(A, B):
    resR = []
    resL = []
    while A + A <= B:
        if B % 2 == 0:
            resR.append(B // 2)
            B //= 2
        else:
            resR.append(1)
            B -= 1

    while A + A <= B:
        resL.append(A)
        A += A

    cnt = 0
    X = A
    while X % 2 == 0:
        cnt += 1
        X >>= 1

    dif = B - A
    while dif:
        for i in reversed(range(cnt + 1)):
            val = 1 << i
            if dif >= val:
                dif -= val
                resL.append(val)
                A += val
                if A % (val * 2) == 0:
                    cnt = max(cnt, i + 1)
                break
    res = resL + resR[::-1]
    print(len(res))
    print(*res, sep=" ")


T = int(input())
query = tuple(tuple(map(int, input().split())) for _ in range(T))
for a, b in query:
    calc(a, b)