anchor.diff:  ;;; Function adjoin
   
   (defun adjoin-identity-eq (name item list)
  -  (if (member-eq-identity name item list)
  +  (if (|member test=eq key=identity| name item list)
         list
         (cons item list)))
   
   (defun adjoin-identity-eql (name item list)
  -  (if (member-eql-identity name item list)
  +  (if (|member test=eql key=identity| name item list)
         list
         (cons item list)))
   
   (defun adjoin-identity-test (name item list test)
  -  (if (member-test-identity name item list test)
  +  (if (|member test=other key=identity| name item list test)
         list
         (cons item list)))
   
   (defun adjoin-identity-test-not (name item list test-not)
  -  (if (member-test-not-identity name item list test-not)
  +  (if (|member test-not=other key=identity| name item list test-not)
         list
         (cons item list)))
   
   (defun adjoin-key-eq (name item list key)
  -  (if (member-eq-key name (funcall key item) list key)
  +  (if (|member test=eq key=other| name (funcall key item) list key)
         list
         (cons item list)))
   
   (defun adjoin-key-eql (name item list key)
  -  (if (member-eql-key name (funcall key item) list key)
  +  (if (|member test=eql key=other| name (funcall key item) list key)
         list
         (cons item list)))
   
   (defun adjoin-key-test (name item list key test)
  -  (if (member-test-key name (funcall key item) list test key)
  +  (if (|member test=other key=other| name (funcall key item) list test key)
         list
         (cons item list)))
   
   (defun adjoin-key-test-not (name item list key test-not)
  -  (if (member-test-not-key name (funcall key item) list test-not key)
  +  (if (|member test-not=other key=other| name (funcall key item) list test-not key)
         list
         (cons item list)))
   
  
positive.code: (defun union-identity-eql (name list1 list2)
    (let ((result list2))
      (with-proper-list-elements (element1 list1 name)
        (unless (member-eql-identity name element1 list2)
  	(push element1 result)))
      result))
  
  (defun union-identity-eq (name list1 list2)
    (let ((result list2))
      (with-proper-list-elements (element1 list1 name)
        (unless (member-eq-identity name element1 list2)
  	(push element1 result)))
      result))
  
  (defun union-key-eql (name list1 list2 key)
    (let ((result list2))
      (with-proper-list-elements (element1 list1 name)
        (unless (member-eql-key name (funcall key element1) list2 key)
  	(push element1 result)))
      result))
  
  (defun union-key-eq (name list1 list2 key)
    (let ((result list2))
      (with-proper-list-elements (element1 list1 name)
        (unless (member-eq-key name (funcall key element1) list2 key)
  	(push element1 result)))
      result))
  
  (defun union-identity-test (name list1 list2 test)
    (let ((result list2))
      (with-proper-list-elements (element1 list1 name)
        (unless (member-test-identity name element1 list2 test)
  	(push element1 result)))
      result))
  
  (defun union-key-test (name list1 list2 key test)
    (let ((result list2))
      (with-proper-list-elements (element1 list1 name)
        (unless (member-test-key name (funcall key element1 ) list2 test key)
  	(push element1 result)))
      result))
  
  (defun union-identity-test-not (name list1 list2 test-not)
    (let ((result list2))
      (with-proper-list-elements (element1 list1 name)
        (unless (member-test-not-identity name element1 list2 test-not)
  	(push element1 result)))
      result))
  
  (defun union-key-test-not (name list1 list2 key test-not)
    (let ((result list2))
      (with-proper-list-elements (element1 list1 name)
        (unless (member-test-not-key name element1 list2 test-not key)
  	(push element1 result)))
      result))
  
  
negative.code: ;;;
  ;;; Function set-exclusive-or
  
  (defun set-exclusive-or-identity-eql (name list1 list2)
    (let ((result '()))
      (with-proper-list-elements (element list1 name)
        (unless (|member test=eql key=identity| name element list2)
  	(push element result)))
      (with-proper-list-elements (element list2 name)
        (unless (|member test=eql key=identity| name element list1)
  	(push element result)))
      result))
  
  (defun set-exclusive-or-identity-eq (name list1 list2)
    (let ((result '()))
      (with-proper-list-elements (element list1 name)
        (unless (|member test=eq key=identity| name element list2)
  	(push element result)))
      (with-proper-list-elements (element list2 name)
        (unless (|member test=eq key=identity| name  element list1)
  	(push element result)))
      result))
  
  (defun set-exclusive-or-key-eql (name list1 list2 key)
    (let ((result '()))
      (with-proper-list-elements (element list1 name)
        (unless (|member test=eql key=other| name (funcall key element) list2 key)
  	(push element result)))
      (with-proper-list-elements (element list2 name)
        (unless (|member test=eql key=other| name (funcall key element) list1 key)
  	(push element result)))
      result))
  
  (defun set-exclusive-or-key-eq (name list1 list2 key)
    (let ((result '()))
      (with-proper-list-elements (element list1 name)
        (unless (|member test=eq key=other| name (funcall key element) list2 key)
  	(push element result)))
      (with-proper-list-elements (element list2 name)
        (unless (|member test=eq key=other| name (funcall key element) list1 key)
  	(push element result)))
      result))
  
  (defun set-exclusive-or-identity-test (name list1 list2 test)
    (let ((result '()))
      (with-proper-list-elements (element1 list1 name)
        (unless (|member test=other key=identity| name element1 list2 test)
  	(push element1 result)))
      ;; we need to use a member with a test with reversed order or arguments
      (with-proper-list-elements (element2 list2 name)
        (unless (|member reversed-test=other key=identity| name element2 list1 test)
  	(push element2 result)))
      result))
  
  (defun set-exclusive-or-key-test (name list1 list2 key test)
    (let ((result '()))
      (with-proper-list-elements (element1 list1 name)
        (unless (|member test=other key=other| name (funcall key element1) list2 test key)
  	(push element1 result)))
      ;; we need to use a member with a test with reversed order or arguments
      (with-proper-list-elements (element2 list2 name)
        (unless (|member reversed-test=other key=other| name (funcall key element2) list1 test key)
  	(push element2 result)))
      result))
  
  (defun set-exclusive-or-identity-test-not (name list1 list2 test-not)
    (let ((result '()))
      (with-proper-list-elements (element1 list1 name)
        (unless (|member test-not=other key=identity| name element1 list2 test-not)
  	(push element1 result)))
      ;; we need to use a member with a test with reversed order or arguments
      (with-proper-list-elements (element2 list2 name)
        (unless (|member reversed-test-not=other key=identity| name element2 list1 test-not)
  	(push element2 result)))
      result))
  
  (defun set-exclusive-or-key-test-not (name list1 list2 key test-not)
    (let ((result '()))
      (with-proper-list-elements (element1 list1 name)
        (unless (|member test-not=other key=other| name (funcall key element1) list2 test-not key)
  	(push element1 result)))
      ;; we need to use a member with a test with reversed order or arguments
      (with-proper-list-elements (element2 list2 name)
        (unless (|member reversed-test-not=other key=other| name (funcall key element2) list1 test-not key)
  	(push element2 result)))
      result))
  
  (defun set-exclusive-or-identity-eq-hash (name list1 list2)
    (let ((table1 (make-hash-table :test #'eq))
  	(table2 (make-hash-table :test #'eq))
  	(result '()))
      (with-proper-list-elements (element list1 name)
        (setf (gethash element table1) t))
      (with-proper-list-elements (element list2 name)
        (setf (gethash element table2) t))
      (with-proper-list-elements (element list1 name)
        (unless (gethash element table2)
  	(push element result)))
      (with-proper-list-elements (element list2 name)
        (unless (gethash element table1)
  	(push element result)))
      result))
  
  (defun set-exclusive-or-identity-eql-hash (name list1 list2)
    (let ((table1 (make-hash-table :test #'eql))
  	(table2 (make-hash-table :test #'eql))
  	(result '()))
      (with-proper-list-elements (element list1 name)
        (setf (gethash element table1) t))
      (with-proper-list-elements (element list2 name)
        (setf (gethash element table2) t))
      (with-proper-list-elements (element list1 name)
        (unless (gethash element table2)
  	(push element result)))
      (with-proper-list-elements (element list2 name)
        (unless (gethash element table1)
  	(push element result)))
      result))
  
  (defun set-exclusive-or-identity-equal-hash (name list1 list2)
    (let ((table1 (make-hash-table :test #'equal))
  	(table2 (make-hash-table :test #'equal))
  	(result '()))
      (with-proper-list-elements (element list1 name)
        (setf (gethash element table1) t))
      (with-proper-list-elements (element list2 name)
        (setf (gethash element table2) t))
      (with-proper-list-elements (element list1 name)
        (unless (gethash element table2)
  	(push element result)))
      (with-proper-list-elements (element list2 name)
        (unless (gethash element table1)
  	(push element result)))
      result))
  
  (defun set-exclusive-or-identity-equalp-hash (name list1 list2)
    (let ((table1 (make-hash-table :test #'equalp))
  	(table2 (make-hash-table :test #'equalp))
  	(result '()))
      (with-proper-list-elements (element list1 name)
        (setf (gethash element table1) t))
      (with-proper-list-elements (element list2 name)
        (setf (gethash element table2) t))
      (with-proper-list-elements (element list1 name)
        (unless (gethash element table2)
  	(push element result)))
      (with-proper-list-elements (element list2 name)
        (unless (gethash element table1)
  	(push element result)))
      result))
  
  (defun set-exclusive-or-key-eq-hash (name list1 list2 key)
    (let ((table1 (make-hash-table :test #'eq))
  	(table2 (make-hash-table :test #'eq))
  	(result '()))
      (with-proper-list-elements (element list1 name)
        (setf (gethash (funcall key element) table1) t))
      (with-proper-list-elements (element list2 name)
        (setf (gethash (funcall key element) table2) t))
      (with-proper-list-elements (element list1 name)
        (unless (gethash (funcall key element) table2)
  	(push element result)))
      (with-proper-list-elements (element list2 name)
        (unless (gethash (funcall key element) table1)
  	(push element result)))
      result))
  
  (defun set-exclusive-or-key-eql-hash (name list1 list2 key)
    (let ((table1 (make-hash-table :test #'eql))
  	(table2 (make-hash-table :test #'eql))
  	(result '()))
      (with-proper-list-elements (element list1 name)
        (setf (gethash (funcall key element) table1) t))
      (with-proper-list-elements (element list2 name)
        (setf (gethash (funcall key element) table2) t))
      (with-proper-list-elements (element list1 name)
        (unless (gethash (funcall key element) table2)
  	(push element result)))
      (with-proper-list-elements (element list2 name)
        (unless (gethash (funcall key element) table1)
  	(push element result)))
      result))
  
  (defun set-exclusive-or-key-equal-hash (name list1 list2 key)
    (let ((table1 (make-hash-table :test #'equal))
  	(table2 (make-hash-table :test #'equal))
  	(result '()))
      (with-proper-list-elements (element list1 name)
        (setf (gethash (funcall key element) table1) t))
      (with-proper-list-elements (element list2 name)
        (setf (gethash (funcall key element) table2) t))
      (with-proper-list-elements (element list1 name)
        (unless (gethash (funcall key element) table2)
  	(push element result)))
      (with-proper-list-elements (element list2 name)
        (unless (gethash (funcall key element) table1)
  	(push element result)))
      result))
  
  (defun set-exclusive-or-key-equalp-hash (name list1 list2 key)
    (let ((table1 (make-hash-table :test #'equalp))
  	(table2 (make-hash-table :test #'equalp))
  	(result '()))
      (with-proper-list-elements (element list1 name)
        (setf (gethash (funcall key element) table1) t))
      (with-proper-list-elements (element list2 name)
        (setf (gethash (funcall key element) table2) t))
      (with-proper-list-elements (element list1 name)
        (unless (gethash (funcall key element) table2)
  	(push element result)))
      (with-proper-list-elements (element list2 name)
        (unless (gethash (funcall key element) table1)
  	(push element result)))
      result))
  
  (defun set-exclusive-or (list1 list2 &key key test test-not)
  