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(/VERSIONCHECK 2)
(DEFPARAMETER |CancellationAbelianMonoid;AL| 'NIL)
(DEFUN |CancellationAbelianMonoid| ()
(LET (#:G1396)
(COND
(|CancellationAbelianMonoid;AL|)
(T (SETQ |CancellationAbelianMonoid;AL|
(|CancellationAbelianMonoid;|))))))
(DEFUN |CancellationAbelianMonoid;| ()
(PROG (#0=#:G1394)
(RETURN
(PROG1 (LETT #0#
(|Join| (|AbelianMonoid|)
(|mkCategory| '|domain|
'(((|subtractIfCan|
((|Union| $ "failed") $ $))
T))
NIL 'NIL NIL))
|CancellationAbelianMonoid|)
(SETELT #0# 0 '(|CancellationAbelianMonoid|))))))
(SETQ |$CategoryFrame|
(|put| '|CancellationAbelianMonoid| '|isCategory| T
(|addModemap| '|CancellationAbelianMonoid|
'(|CancellationAbelianMonoid|) '((|Category|)) T
'|CancellationAbelianMonoid| |$CategoryFrame|)))
(MAKEPROP '|CancellationAbelianMonoid| 'NILADIC T)
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