anchor.diff:    (setf a 100)
     (let ((a 5)
           (b (* 10 a)))
  -    (assert-equal b ___)))
  +    (assert-equal b 1000)))
   
   (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 ___))
  +    (assert-equal b 50))
  +  (assert-equal a 100))
   
   
   (define-test write-your-own-let-statement
  
positive.code:      lexical form.  After which, the previous value, if it exists, is visible again."
    (setf a 10)
    (setf b 20)
    (assert-equal a ___)
    (assert-equal b ___)
    (let ((a 1111)
          (b 2222))
      (assert-equal a ___)
      (assert-equal b ___))
    (assert-equal a ___)
    (assert-equal b ___))
  
  
  (define-test test-let-default-value
      "let vars have a default value"
      (let ((x))
        (assert-equal ___ x)))
  
  (define-test test-let-bindings-are-parallel
      "When defining the bindings in the let form, later bindings may not depend
  
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 :bart) :homer)
  		((equal input :stewie) :peter)
  		((equal input :stan) :randy)
          (t :unknown)))
  
  (define-test test-your-own-cond-statement
  