t=int(input())
for _ in range(t):
    a,b=map(int,input().split())
    moves=[]
    cnt=0
    for i in range(1,100):
        if a%(2**i)==0:
            cnt=i
        else:
            break
    for i in range(cnt,100):
        if 2**i<=(b-a):
            if (a//(2**i))%2==1:
                moves.append(2**i)
                a+=2**i
        else:
            break
    flag=format(b-a,'b')
    l=len(flag)
    for i in range(l):
        if flag[i]=='1':
            moves.append(2**(l-i-1))
            a+=2**(l-i-1)
    print(len(moves))
    print(*moves)