import sys
input = lambda : sys.stdin.readline().rstrip()
sys.setrecursionlimit(max(1000, 10**9))
write = lambda x: sys.stdout.write(x+"\n")


t = int(input())
ans = [None]*t
from math import gcd
def sub(a,b):
    if a==b:
        return []
    l = []
    g = gcd(a,b)
    l.append(g)
    l.extend(sub(a+g,b))
    return l
        
for ind in range(t):
    a,b = list(map(int, input().split()))
    ans = sub(a,b)
    print(len(ans))
    write(" ".join(map(str, ans)))