Two women having a conversation.
Two sisters are having a friendly chat.
Not all pairs of women are sisters. Not all conversations are friendly.
exists e1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_have(e1) & n_conversation(x3) & (x1 = x2) & n_woman(x1) & card_eq_2(x1))
exists e1 s1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_have(e1) & n_chat(x2) & a_friendly(s1) & Theme(s1,x2) & n_sister(x1) & card_eq_2(x1))