Two girls in shorts and T-shirts are laughing while sitting on wooden steps.
The two girls laughing are zombies.
Girls laughing being zombies is totally contradictory as in sentence 1.
exists e1 e2 s1 x1 x2 x3 x4 x5.(while(e1,e2) & on(e2,x5) & n_step(x5) & a_wooden(s1) & Theme(s1,x5) & Actor(e2,x1) & v_sit(e2) & Actor(e1,x1) & v_laugh(e1) & in(x1,x2) & subset_of(x4,x2) & n_t-shirt(x4) & subset_of(x3,x2) & n_shorts(x3) & n_girl(x1) & card_eq_2(x1))
exists e1 p1 x1 x2.(n_girl(x1) & card_eq_2(x1) & exists x3.((x1 = x3) & n_zombie(x3)) & Actor(e1,x2) & v_laugh(e1) & (x1 = x2))