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mod41.hs:3:18:
Illegal instance declaration for ‘Eq (Either a a)’
(All instance types must be of the form (T a1 ... an)
where a1 ... an are *distinct type variables*,
and each type variable appears at most once in the instance head.
Use FlexibleInstances if you want to disable this.)
In the instance declaration for ‘Eq (Either a a)’
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