anchor.diff:       insert the correct function names, instead of WRONG-FUNCTION-X
        to define an inner product."
     (defun inner (x y) 
  -    (reduce #'WRONG-FUNCTION-2 (mapcar #'WRONG-FUNCTION-3 x y)))
  +    (reduce #'+ (mapcar #'* x y)))
     (assert-equal 32 (inner '(1 2 3) '(4 5 6)))
     (assert-equal 310 (inner '(10 20 30) '(4 3 7))))
  
positive.code:     "The mapcar function can be applied to
       more than one list. It applies a function
       to successive elements of the lists."
    (assert-equal ____ (mapcar #'* '(1 2 3) '(4 5 6)))
    (assert-equal ____ (mapcar #'list '("lisp" "are") '("koans" "fun"))))
  
  
  (define-test test-transpose-using-mapcar
      "Replace WRONG-FUNCTION with the correct function (don't forget
       the #') to take the 'transpose'."
    (defun WRONG-FUNCTION-1 (&rest rest) '())
    (defun transpose (L) (apply #'mapcar (cons #'WRONG-FUNCTION-1 L)))
      (assert-equal '((1 4 7)
                    (2 5 8) 
                    (3 6 9)) 
  
negative.code:     "We can apply a function to each member
       of a list using mapcar."
    (defun times-two (x) (* x 2))
    (assert-equal '(2 4 6) (mapcar #'times-two '(1 2 3)))
    (assert-equal '(3 "little" "pigs") (mapcar #'first '((3 2 1) 
                                        ("little" "small" "tiny") 
                                        ("pigs" "hogs" "swine")))))
  
  