I'm practicing Prolog by coming up with a very simple database of who has sent and received emails.
I have created a list using findall of the receivers of a pre-specified X.
I'm practicing Prolog by coming up with a very simple database of who has sent and received emails.
I have created a list using findall of the receivers of a pre-specified X.
to use your list/2:
but the easiest way is sort/2, or better setof/3