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Saving a few bytes is a poor reason to leave out the toc.ncx file.
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I just went back to the
OPF spec:
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1.4.1.2: Publication Conformance
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vii. the required NCX, encoded in either UTF-8 or UTF-16, is included; and
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bolding is in the original
So if you leave it out, you don't have an epub document. It's that simple.