three boys and a mom at the harbor.
Four people near the water.
People refers to boys and mom.
exists s1 x1 x2 x3.(n_harbor(x3) & a_topic(s1) & subset_of(x2,s1) & at(x2,x3) & n_mom(x2) & subset_of(x1,s1) & n_boy(x1) & card_eq_3(x1))
exists x1 x2.(n_water(x2) & a_topic(x1) & near(x1,x2) & n_people(x1) & card_eq_4(x1))