A group if kids giving a demonstration in a classroom.
Kids are putting on a play.
A play and a demonstration are not the same thing.
exists e1 x1 x2 x3 x4 x5.(a_topic(x1) & in(e1,x5) & n_classroom(x5) & Theme(e1,x4) & Actor(e1,x3) & v_give(e1) & n_demonstration(x4) & (x1 = x3) & if(x1,x2) & n_kid(x2) & n_group(x1))
exists e1 x1 x2 x3.(on(e1,x3) & n_play(x3) & Theme(e1,x2) & Actor(e1,x1) & v_put(e1) & n_thing(x2) & n_kid(x1))