Haskell的Functor习题

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Is this statement true or false?
The composition of two Functors is also a Functor.
If false, give a counterexample; if true, prove it by exhibiting some appropriate Haskell code.

链接： http://www.haskell.org/haskellwiki/Typeclassopedia#Instances 习题5

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true false Haskell