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Finished the function of performing extra reductions.
Still untested though.
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I decide to adopt a new approach of recording and updating item
derivation forests. Since this affects a lot of things, I decide to
commit before the refactor, so that I can create a branch for that
refactor.
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Previously cloning a node does not alter the root of the forest, while
it should alter the root if the cloned node was the root. This would
affect how we compare the equalities of forests. It indeed resulted
in anomalies that were hard to solve.
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I need more than the ability to clone nodes: I also need to split the
nodes. Now this seems to be correctly added.
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