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Manipulate functions after definition (define (double x) (+ x x)) → (lambda (x) (+ x x)) (first double) → (x) (last double) → (+ x x) ;; make a ''fuzzy'' double (setf (double 1) '(mul (normal x (div x 10)) 2)) (double 10) → 20.31445313 (double 10) → 19.60351563 This example is in code patterns. Sect...