Welcome to SWI-Prolog (Multi-threaded, 64 bits, Version 5.6.64)
Copyright (c) 1990-2008 University of Amsterdam.
SWI-Prolog comes with ABSOLUTELY NO WARRANTY. This is free software,
and you are welcome to redistribute it under certain conditions.
Please visit http://www.swi-prolog.org for details.

For help, use ?- help(Topic). or ?- apropos(Word).

% /home/steve/Documents/i_prolog.pl compiled 0.00 sec, 30,056 bytes
SWI-Prolog engine already initialised at /usr/local/lib/perl/5.10.0/Language/Prolog/Yaswi/Low.pm line 63.