T = int(input())
AB = [list(map(int,input().split())) for _ in range(T)]

for a,b in AB:
    ans = []
    i = 0
    bin = 1
    while a // bin != b // bin:
        if a % (bin*2) != 0:
            a += bin
            ans.append(bin)
        bin *= 2
    bin //= 2
    while a != b:
        if (b - a) // bin != 0:
            a += bin
            ans.append(bin)
        bin //= 2
    print(len(ans))
    print(*ans)