Two people ride the train.
Two friends are riding the train together.
Not all people are friends.
exists e1 x1 x2.(n_train(x2) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_people(x1) & card_eq_2(x1))
exists e1 s1 x1 x2.(n_train(x2) & a_together(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_friend(x1) & card_eq_2(x1))