A large crowd waiting at a train crossing.
The people are ridding in a train.
waiting is contradictory to ridding
exists e2 e1 s1 x1 x2 x3 x4.(a_topic(x1) & at(e1,x3) & Actor(e2,x4) & v_cross(e2) & (x3 = x4) & n_train(x3) & Actor(e1,x2) & v_wait(e1) & (x1 = x2) & n_crowd(x1) & a_large(s1) & Theme(s1,x1))
exists e1 x1 x2.(n_people(x1) & in(e1,x2) & n_train(x2) & Actor(e1,x1) & v_rid(e1))