People sitting and waving in a mini Pullman train.
The train is empty.
If people are sitting in a train, the train can't be empty.
exists e2 e1 s1 x1 x2 x3 x4.(in(e2,x3) & n_train(x3) & of(x3,x4) & n_pullman(x4) & a_mini(s1) & Theme(s1,x3) & Actor(e2,x2) & v_wave(e2) & n_people(x2) & Actor(e1,x1) & v_sit(e1) & n_people(x1))
exists s1 x1.(n_train(x1) & Theme(s1,x1) & a_empty(s1))