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The issue is that the internal ToC (of an ePub) currently is useless. There's no easy way to get to it. The NCX has an easy way to get to it. But why would we then want to go from the NCX to an internal ToC. We only need one ToC as long as there is an easy way to get to it. It doesn't matter if it is internal or external as long as it's just one and there is an external link to get to it.
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