Subject: Please refresh my memory

From: Gunnar Lindholm <[email-masked]>
Date: Wed, 05 Apr 2000 22:05:52 +0200

Hello.
I just started with prolog after a far to long break, and now I don't remember
how to create facts. From a textbook I find the usage:  "consult(file.pl)."
where  file.pl contains:
likes(john,mary).
likes(..........
and so on...

But how do enter this directly into the "pl" program? I tried 
likes(john,mary). but I only got the message:
ERROR: Undefined procedure: likes/2

There is something I don't remember, and I hope you can help me with this.
Best wishes 
Gunnar.