- Straightforward refutation of the old idea. This complete refutation is atypical. More likely the new knowledge doesn’t contradict the old one, but it may modify it in some way.
- The new knowledge revises a simpler picture by filling it with more complex details. This is similar to adding new knowledge, although because the older, simpler view of the issue has been overwritten with more detail, there is some unlearning going on.
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