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feat(Data/Setoid/Basic):
prod
and piSetoid
lemmas and equivs
Add lemmas about applying `Setoid.r` for `Setoid.prod` and `piSetoid`, and equivalences between a (pairwise or indexed) product of quotients and the corresponding quotient of the product by `Setoid.prod` or `piSetoid`. From AperiodicMonotilesLean.
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