Three employees in white serve customers wine and canapes.
A houseboat on the water.
Employees who serve customers wine and canapes can not be on a houseboat on the water.
exists e1 s1 x1 x2 x3 x4 x5 x6.(Theme(e1,x3) & Actor(e1,x1) & v_serve(e1) & subset_of(x6,x3) & n_canape(x6) & subset_of(x4,x3) & Time(x4,x5) & n_wine(x5) & n_customer(x4) & Theme(s1,x2) & a_white(s1) & (x1 = x2) & n_employee(x1) & card_eq_3(x1))
exists x1 x2.(n_water(x2) & a_topic(x1) & on(x1,x2) & n_houseboat(x1))