A group of children having a snack listening to a lecture.
Children eat while listening to a presentation.
the children are eating a snack and the presentation is a lecture
exists e1 x1 x2 x3 x4 x5 x6.(a_topic(x1) & of(x1,x2) & Theme(e1,x4) & Actor(e1,x3) & v_have(e1) & to(x4,x6) & n_lecture(x6) & n_listening(x4) & of(x4,x5) & n_snack(x5) & (x2 = x3) & n_child(x2) & n_group(x1))
exists e2 e1 x1 x2.(while(e1,e2) & to(e2,x2) & n_presentation(x2) & Actor(e2,x1) & v_listen(e2) & Actor(e1,x1) & v_eat(e1) & n_child(x1))