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drvfail003.hs:16:56:
No instance for (Show (v (v a)))
arising from the 'deriving' clause of a data type declaration
Possible fix:
add an instance declaration for (Show (v (v a)))
or use a standalone 'deriving instance' declaration,
so you can specify the instance context yourself
When deriving the instance for (Show (Square_ v w a))
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