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The only way to completely hide the nav on broken epub3 readers that do not properly honour spine attributes is to remove its entry from the spine manually editing the opf. You may need to edit the nav as well to remove a landmark entry to the toc.
A better solution, especially for accessibility reasons is to create a proper nav as JSWolf recommends that points to the cover, and any natural sections. These not be chapters and they need not start at the top of page.
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