T = int(input())
for _ in range(T):
    X = []
    A,B = map(int,input().split())
    C = B-A
    a1 = 1
    a2 = A
    while a2%2==0:
        a2 = a2//2
        a1 = a1*2
    while True:
        if C<=a1:
            k = len(bin(C)[2:])
            for i in range(k-1,-1,-1):
                if (C>>i)&1:
                    X.append(pow(2,i))
            break
        C -= a1
        X.append(a1)
        a2 += 1
        while a2%2==0:
            a2 = a2//2
            a1 *= 2
    print(len(X))
    print(*X)