Two children are in a sack race while a third child watches.
Two children racing in sacks.
A sack race involves racing in sacks.
exists p1 s1 x1 x2 x3.(while(p1,x2) & n_watch(x2) & of(x2,x3) & n_child(x3) & a_third(s1) & Theme(s1,x2) & exists x4 x5.(in(x1,x4) & n_race(x4) & of(x4,x5) & n_sack(x5)) & n_child(x1) & card_eq_2(x1))
exists e1 x1 x2 x3.(a_topic(x1) & in(e1,x3) & n_sack(x3) & Actor(e1,x2) & v_race(e1) & (x1 = x2) & n_child(x1) & card_eq_2(x1))