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	LIST? will return true of those objects generated by LIST.

	That is precisely the case.  The previous proposed definition
for LIST? would return true of things which are not propoer lists, but
LIST can only generate proper lists.  Since there is no way (that I
know of) of knowing whether a paricular pair-tree was created by a
call to LIST or not (besides the fact that it seems undesirable), the
only way to make this consistent is for LIST? to return #!true only on
proper lists.