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件名　Question to Practiacal Common Lisp

本文

There was a point that did not understand now though I was reading Practical Common Lisp.
May I ask question on this point ?
The point is a part of "Thus,the only objects referenced in common by the original tree and the copy
produced by COPY-TREE are the numbers 5, 6, and the symbol NIL."on page 155.
Why are not the numbers 1,2,3,4 referenced in common ?
I am not good at English because I am Japanese... therefore I am afraid of not writting this Email well.
But I think that this book is wonderful. And, it get me to send E-mail
I'm looking forward to receiving reply.

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こんな感じの文章で良いんでしょうか？