def solve():
    a, b = map(int, input().split())
    left = []
    right = []
    i = 1
    while a < b:
        if a % 2 == 1:
            a += 1
            left.append(i)
        if b % 2 == 1:
            b -= 1
            right.append(i)
        a >>= 1
        b >>= 1
        i *= 2
    ans = left + right[::-1]
    print(len(ans))
    print(*ans)
    
for _ in range(int(input())):
    solve()