Why does SWI-Prolog only give me the first answer?

Question

I\'m new to Prolog. I\'m just trying simple examples to learn. I have this .pl file with these lines:

parent(pam,bob).
parent(tom,bob).
parent(t         


        

Answer 1

don't hit enter after your first results shows, use spacebar instead

• [Enter] stops execution even if the backtracking is not completed yet
• [Spacebar] or [;] continues with backtracking from your last result to the next result or false if there are no other results left.