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