T=int(input())

for _ in range(T):
    A,B=map(int,input().split())
    x=A

    X=[]
    while x+(x&(-x))<=B:
        X.append(x&(-x))
        x+=x&(-x)

    d=B-x
    while d:
        c=(d-1).bit_length()

        if c:
            z=1<<(c-1)
        else:
            z=1

        X.append(z)
        d-=z

    print(len(X))
    print(*X)