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mc20.hs:12:9:
No instance for (Ord Unorderable)
arising from a use of `Control.Monad.Group.mgroupWith'
Possible fix: add an instance declaration for (Ord Unorderable)
In the expression: Control.Monad.Group.mgroupWith
In a stmt of a monad comprehension: then group by x
In the expression: [() | x <- [Gnorf, Brain], then group by x]
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