"The significant effects proposed by the 5 packages do not agree --neither with each other nor with the book."
Is this really wrong? I know the rule about using neither/nor only with affirmative statements, but it just feels so right.
I'm proofreading a text and wanted to add this. But the grammar check insists that it's incorrect (I know, not always reliable). I was hoping that setting it apart with the double-hyphen would separate it sufficiently from the affirmative verb.