anchor.diff:    (setf a 100)
     (setf b 23)
     (setf c 456)
  -  (let ((a 0)
  -        (b __)
  -        (c __))
  +  (let ((a 100)
  +        (b 200)
  +        (c "Jellyfish"))
       (assert-equal a 100)
       (assert-equal b 200)
       (assert-equal c "Jellyfish"))
  -  (let* ((a 0))
  +  (let* ((a 121) (b 200) (c 14841/121))
       (assert-equal a 121)
       (assert-equal b 200)
       (assert-equal c (+ a (/ b a)))))
  
positive.code:   (setf a 100)
    (let ((a 5)
          (b (* 10 a)))
      (assert-equal b ___)))
  
  (define-test test-let*-bindings-are-series
      "let* is like let, but successive bindings may use values of previous ones"
    (setf a 100)
    (let* ((a 5)
           (b (* 10 a)))
      (assert-equal b ___))
    (assert-equal a ___))
  
  
  (define-test write-your-own-let-statement
  
negative.code:         (cond ((> a 0) :positive)
                ((< a 0) :negative)
                (t :zero)))
    (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
  