Expect ref node 'E'; pointer before: A B C D * [E] F G H I
remove node 'E'
Expect ref node 'F'; pointer before: A B C D * [F] G H I
Expect ref node 'E'; pointer before: A B C D * [E] F G H I
remove node 'E'
Expect ref node 'F'; pointer before: A B C D * [F] G H I