for _ in range(int(input())):
    a,b=map(int,input().split())
    c=1
    ans=[]
    while a>=c:
        if a&c and a+c<=b:
            a+=c
            ans.append(c)
        if a&c:
        	break
        c<<=1
    while c:
        if a+c<=b:
            a+=c
            ans.append(c)
        c>>=1
    print(len(ans))
    print(" ".join(map(str,ans)))