Negros walk across a train track that stretches over dirt and garbage beside a row of poor shacks.
The people are outside.
The people are outside implies negros
exists e1 e2 s1 x1 x2 x3 x4 x5 x6 x7 x8 x9.(across(e1,x2) & beside(e2,x8) & of(x8,x9) & n_shack(x9) & a_poor(s1) & Theme(s1,x9) & n_row(x8) & over(e2,x5) & n_garbage(x7) & n_dirt(x6) & subset_of(x7,x5) & subset_of(x6,x5) & Actor(e2,x4) & v_stretch(e2) & (x2 = x4) & n_track(x2) & of(x2,x3) & n_train(x3) & Actor(e1,x1) & v_walk(e1) & n_negro(x1))
exists s1 x1.(n_people(x1) & Theme(s1,x1) & a_outside(s1))