import sys
input = sys.stdin.readline

T=int(input())
for tests in range(T):
    A,B=map(int,input().split())
    ANS=[]

    while True:
        for i in range(80):
            if (1<<i)>B:
                target=(1<<(i-1))
                break

        if A>target:
            A-=target
            B-=target
        else:
            break
    
    while A<target:
        X=A
        twos=1
        while X%2==0:
            X//=2
            twos*=2

        ANS.append(twos)
        A+=twos

    B-=A
    while B!=0:
        for i in range(80):
            if (1<<i)>B:
                break
        ANS.append(1<<(i-1))
        B-=1<<(i-1)

    print(len(ANS))
    print(*ANS)