Adding to Principle #6 and Principle #7, we should spell out:
It is quite possible to have seeming contradictions even between infallible documents of the magisterium, and a fortiori between fallible documents.
This is due to the possibility of doctrinal development. To cite yet again Donum Veritatis 24,
The theologian knows that some judgments of the Magisterium could be justified at the time in which they were made, because while the pronouncements contained true assertions and others which were not sure, both types were inextricably connected. Only time has permitted discernment and, after deeper study, the attainment of true doctrinal progress.
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