Children in uniforms chase pigeons.
Children are reading books in their classroom.
Children are either chase pigeons or reading books, cannot be doing both.
exists x1 x2 x3.(a_topic(x1) & in(x1,x2) & n_chase(x2) & Time(x2,x3) & n_pigeon(x3) & n_uniform(x2) & n_child(x1))
exists e1 x1 x2 x3.(in(e1,x3) & n_classroom(x3) & of(x3,x1) & n_thing(x1) & Theme(e1,x2) & Actor(e1,x1) & v_read(e1) & n_book(x2) & n_child(x1))