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Exercises

Exercise 7.23: Pass in a predicate to a general procedure that returns the titles of the movies satisfying the predicate: 
     (titles-of-movies-satisfying database predicate)

Ex:  (titles-of-movies-satisfying 
       our-movie-database 
       (lambda (movie) (= (movie-year-made movie) 1974))
     ⇒ ((amarcord))
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