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[no subject]

Typing to MACSYMA's LISP:
leads to ;EVAL-WHEN error from location 72384
	 ;program trapped while in EQTEST  .
The message is printed out by MACSYMA's MACHINE-ERROR handler 
(called MACHERRFUN).  MACSYMA is indeed trying to RPLACA pure 
structure here (MSIMPIND is a purified property), but EVAL-WHEN 
is the wrong type error.