Exercise 2.55.  Eva Lu Ator types to the interpreter the expression

(car ''abracadabra)

To her surprise, the interpreter prints back quote. Explain.

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The single quote is equivalent to the (quote ...) form, so we have:

(car (quote (quote abracadabra))).

This quotes the list "(quote abracadabra)" and then takes the car of 
that list which is "quote".