A couple sits outside a colorful restaurant.
An umbrella sits in the center of the table.
WE have no idea if an umbrella sits in the center of a table, we don't even know they are at a table and not all tables have umbrellas.
exists e1 s1 x1 x2.(outside(e1,x2) & n_restaurant(x2) & a_colorful(s1) & Theme(s1,x2) & Actor(e1,x1) & v_sit(e1) & n_couple(x1))
exists e1 x1 x2 x3.(n_table(x3) & n_center(x2) & in(e1,x2) & of(x2,x3) & Actor(e1,x1) & v_sit(e1) & n_umbrella(x1))