anchor.diff:    (assert-equal '(- 2013 1978) (second *log*)))
   
   ;; Now you must write a more advanced log-form, that also records the value
  +
   ;; returned by the form
   
   (defvar *log-with-value* nil)
  
positive.code:      preceded by a comma (,) are evaluated, rather then left as literals"
    (let ((num 5)
          (word 'dolphin))
      (true-or-false? ___  (equal '(1 3 5) `(1 3 5)))
      (true-or-false? ___  (equal '(1 3 5) `(1 3 num)))
      (assert-equal ____ `(1 3 ,num))
      (assert-equal ____ `(word ,word ,word word))))
  
  
  (define-test test-at-form
  
negative.code:   (let ((x 0)
          (y 0))
      (double-setf-BAD x y (+ x 100))
      (assert-equal x 100)
      (assert-equal y 200)))
  
  ;; sets sym1 and sym2 to val
  (defmacro double-setf-SAFER (sym1 sym2 val)
  