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%   Purpose: Table of built-in predicates.

/*  This table exists for two reasons.
    1.  A user who can't remember what's available can just say listing(system).
    2.  Tools such as debuggers and cross-referencers can tell the difference
	between the user's predicates and the system's, they should not trace
	system predicates.
    Note that there are a couple of dozen predicates (mostly beginning with $)
    





















































































































































































































































































































































































































































































































































































































































































































































































































































































































































