T = int(input())
MAX_COUNT = 120
for _ in range(T):
    A,B = map(int,input().split())
    count = 0
    flg = False
    l = []
    while count < MAX_COUNT:
        for m in range(A,0,-1):
            if A%m == 0:
                if A+m <= B:
                    A += m
                    l.append(m)
                    count += 1
                    if A == B:
                        flg = True
                    break
        if flg:
            print(len(l))
            print(*l)
            break