Four boys play on a merry-go-round at a park.
Brothers and sisters playing on a merry-go-round.
It is unknown whether or not the four boys are related. They may be brothers but definitely not sisters!
exists e1 x1 x2 x3.(at(e1,x3) & n_park(x3) & on(e1,x2) & n_merry-go-round(x2) & Actor(e1,x1) & v_play(e1) & n_boy(x1) & card_eq_4(x1))
exists e1 s1 x1 x2 x3 x4.(ne_org_brothers(x1) & a_topic(s1) & subset_of(x2,s1) & on(e1,x4) & n_merry-go-round(x4) & Actor(e1,x3) & v_play(e1) & (x2 = x3) & n_sister(x2) & subset_of(x1,s1))