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Letter requirements in OR logic (which is the main thing OR logic is
used for) is simplified now. Any requirement within the OR logic that is
redundant with the top level requirement now has the redundant letters
removed. If a clause in a disjunction becomes empty due to this, the
disjunction can be removed. Additionally, if all of the clauses in a
disjunction are identical, then they can be merged into the top level
requirement.
I manually verified that every requirement that is affected by this
simplification looks correct.
Region objects are also now used in access checking instead of looking
up the regions by name during access checking. This is a little faster
for access checks that involve a lot of rooms, such as the Maze
Gravestone.
Finally, locations no longer check for access to the region the location
is in, and connections no longer check for access to the source region,
because these are both implied by how the graph works.
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