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    aircrafts, helicopter, container ships: You don’t need to know theory to use them. Just turn on the engine and GO!!!

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      A more fair comparison would be numbers, vectors and matrices, you certainly need to know a lot of theory to fly, but very little to make use of these objects.

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      There is no mention of type class laws in this post. Without these laws, Haskell’s standard type classes are completely meaningless.