import sys
def I(): return int(sys.stdin.readline().rstrip())
def MI(): return map(int,sys.stdin.readline().rstrip().split())


T = I()
for _ in range(T):
    A,B = MI()
    ANS = []
    while A+(A & (-A)) <= B:
        ANS.append(A & (-A))
        A += A & (-A)
    l = B.bit_length()
    for i in range(l-1,-1,-1):
        if (B>>i) & 1 and not (A>>i) & 1:
            ANS.append(1<<i)
    print(len(ANS))
    print(*ANS)