Two young people serve food.
Two waitresses clear empty plates from the table.
You can't serve food at the same time you clear a table.
exists e1 s1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_serve(e1) & n_food(x2) & n_people(x1) & a_young(s1) & Theme(s1,x1) & card_eq_2(x1))
exists s1 s2 x1 x2 x3.(n_table(x3) & a_topic(x1) & from(x1,x3) & n_plate(x1) & a_empty(s2) & Theme(s2,x1) & a_clear(s1) & Theme(s1,x1) & of(x1,x2) & n_waitress(x2) & card_eq_2(x1))