A man and child on a ship doing maintenance.
Two old men do maintenance on a ship.
One cannot be a child and old man at same time.
exists e1 s1 x1 x2 x3 x4 x5.(a_topic(s1) & on(s1,x3) & Theme(e1,x5) & Actor(e1,x4) & v_do(e1) & n_maintenance(x5) & (x3 = x4) & n_ship(x3) & n_child(x2) & n_man(x1) & subset_of(x2,s1) & subset_of(x1,s1))
exists e1 s1 x1 x2 x3.(on(e1,x3) & n_ship(x3) & Theme(e1,x2) & Actor(e1,x1) & v_do(e1) & n_maintenance(x2) & n_man(x1) & a_old(s1) & Theme(s1,x1) & card_eq_2(x1))