Three men in a boat on the water.
Three men are on a skimboard on the shore.
A skimboard is not a boat.
exists x1 x2 x3.(n_water(x3) & a_topic(x1) & in(x1,x2) & on(x2,x3) & n_boat(x2) & n_man(x1) & card_eq_3(x1))
exists p1 x1 x3.(n_shore(x3) & exists x2.(on(x1,x2) & on(x2,x3) & n_skimboard(x2)) & n_man(x1) & card_eq_3(x1))