Change mrph2 by (opps mrph2) in line 240
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@ -237,7 +237,7 @@ composition of two morphisms, where the optional argument is a strategy.
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(error "In 2MRPH-SBTR, ~A and ~A may not be subtracteded."
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(error "In 2MRPH-SBTR, ~A and ~A may not be subtracteded."
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mrph1 mrph2))
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mrph1 mrph2))
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(when (eq (first (orgn mrph1)) 'zero-mrph)
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(when (eq (first (orgn mrph1)) 'zero-mrph)
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(return-from sbtr mrph2))
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(return-from sbtr (opps mrph2)))
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(when (eq (first (orgn mrph2)) 'zero-mrph)
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(when (eq (first (orgn mrph2)) 'zero-mrph)
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(return-from sbtr mrph1))
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(return-from sbtr mrph1))
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(unless strt
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(unless strt
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