Two men are on a police boat.
There are people on a boat.
Men are people.
exists p1 x1.(exists x2 x3.(on(x1,x2) & n_boat(x2) & of(x2,x3) & n_police(x3)) & n_man(x1) & card_eq_2(x1))
exists p1 x1 x2 x3.((x1 = x2) & on(x2,x3) & n_boat(x3) & n_people(x2))