import math
T = int(input())
for _ in range(T):
    A,B = map(int,input().split())
    ANS = []
    if len(format(A, 'b'))!=len(format(B, 'b')):
        if len(format(A, 'b')) != len(format(B, 'b')):
            for i in range(math.ceil(math.log2(A))):
                if 2**i & A == 2**i:
                    A += 2**i
                    ANS.append(2**i)
        while len(format(A, 'b'))!=len(format(B, 'b')):
            ANS.append(A)
            A*=2
        AB = format(A, 'b')
        for i in range(len(AB)):
            AB = format(A, 'b')
            BB = format(B, 'b')
            if AB[i] != BB[i]:
                ANS.append(2**(len(AB)-i-1))
                A+=2**(len(AB)-i-1)
    else:
        AB = format(A, 'b')
        BB = format(B, 'b')
        for i in range(len(AB)):
            if AB[i] != BB[i]:
                for j in reversed(range(i,len(AB))):
                    AB = format(A, 'b')
                    if AB[i]=='1':
                        A += (2**(len(AB)-j-1))
                        ANS.append((2**(len(AB)-j-1)))  

        for i in reversed(range(len(AB))):
            AB = format(A, 'b')
            BB = format(B, 'b')
            if AB[i] != BB[i]:
                A += (2**(len(AB)-i-1))
                ANS.append((2**(len(AB)-i-1)))

    print(len(ANS))
    print(*ANS)