A group of kids sitting in the back of a van together looking at a book.
kids in a van
In the back of the van means it's in the van.
exists e1 e2 s1 x1 x2 x3 x4 x5 x6.(n_back(x4) & a_topic(x1) & of(x1,x2) & for(e1,e2) & at(e2,x6) & n_book(x6) & Actor(e2,x3) & v_look(e2) & a_together(s1) & Manner(e1,s1) & in(e1,x4) & of(x4,x5) & n_van(x5) & Actor(e1,x3) & v_sit(e1) & (x2 = x3) & n_kid(x2) & n_group(x1))
exists x1 x2.(a_topic(x1) & in(x1,x2) & n_van(x2) & n_kid(x1))