newbie question:swi-prolog,color's meaning

From: chenyu (chenyu468_at_yahoo.com)
Date: 01/18/04


Date: 18 Jan 2004 00:21:55 -0800

hello, everyone,
In the source code file of prolog, some predicate's name are "black"
color and some are "red" color. What's the meaning of them?

Thank you for your attention.
kind regards/chenyu



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