Girls playing in a sand playground.
Some girls serve tea.
One cannot be playing and serving tea at the same time.
exists x1 x2 x3 x4.(a_topic(x1) & in(x1,x3) & n_playground(x3) & of(x3,x4) & n_sand(x4) & n_playing(x1) & (x1 = x2) & ne_nam_girls(x2))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_serve(e1) & n_tea(x2) & n_girl(x1))