A girl and a boy laughing
Two children are laughing.
girl and a boy laughing simply means children are laughing
exists e1 s1 x1 x2 x3.(a_topic(s1) & subset_of(x2,s1) & Actor(e1,x3) & v_laugh(e1) & (x2 = x3) & n_boy(x2) & subset_of(x1,s1) & n_girl(x1))
exists e1 x1.(Actor(e1,x1) & v_laugh(e1) & n_child(x1) & card_eq_2(x1))