three men are having a discussion.
Some people are talking to each other.
Three men are a group of people, or some people.  A discussion is another word for talking to each other.
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_have(e1) & n_discussion(x2) & n_man(x1) & card_eq_3(x1))
exists e1 x1.(all x2.(n_other(x2) -> to(e1,x2)) & Actor(e1,x1) & v_talk(e1) & n_people(x1))