I'm assuming, since Treecat Wars will become an Accelerated reader like the first two books.
This, however, refers to the usage of x-a's instead of simply x-as or "x-a group" etc.
I understand that the language is flexible and I understand that this book is already "out" there. I am very surprised this got past an editor, though.

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As a side note, both my kids (Zoe 12 and David 13) have now read the book. Zoe cried. Both liked it.