anchor.diff:          (cond ((> a 0) :positive)
                 ((< a 0) :negative)
                 (t :zero)))
  -  (assert-equal ____ c))
  +  (assert-equal :positive c))
   
   
   (defun cartoon-dads (input)
     " you should be able to complete this cond statement"
     (cond ((equal input :this-one-doesnt-happen) :fancy-cat)
  +        ((equal input :bart) :homer)
  +        ((equal input :stewie) :peter)
  +        ((equal input :stan) :randy)
           (t :unknown)))
   
   (define-test test-your-own-cond-statement
  
positive.code:   (setf a 100)
    (setf b 23)
    (setf c 456)
    (let ((a 0)
          (b __)
          (c __))
      (assert-equal a 100)
      (assert-equal b 200)
      (assert-equal c "Jellyfish"))
    (let* ((a 0))
      (assert-equal a 121)
      (assert-equal b 200)
      (assert-equal c (+ a (/ b a)))))
  
negative.code:     "setf is used to assign values to symbols.  These symbols my refer to
       variables with lexical or dynamic scope."
    (setf my-name "David")
    (assert-equal my-name "David")
    " In SBCL, if the symbol isn't defined as a variable, via a top-level defvar
    or let statement, the setf call may result in a warning."
    (setf my-clones-name my-name)
    (assert-equal "David" my-clones-name)
    (setf a 5)
    (setf b 10)
    (setf c 50)
    (assert-equal 50 c))
  
  
  