Load intro.pl into Prolog by typing
[intro].
The ``yes'' at the end indicates that Prolog checked the code and found no errors.
Check all of what Prolog has recorded by asking for a listing.
?- listing. % Foreign: rl_add_history/1 % Foreign: rl_read_init_file/1 likes(mary, food). likes(mary, wine). likes(john, food). likes(john, wine). Yes