Two chinese people are standing by a chalkboard.
Two thugs spraying graffiti on a chalkboard.
Standing by a chalkboard is not the same as spraying graffiti in the chalkboard.
exists e1 s1 x1 x2.(by(e1,x2) & n_chalkboard(x2) & Actor(e1,x1) & v_stand(e1) & n_people(x1) & a_chinese(s1) & Theme(s1,x1) & card_eq_2(x1))
exists e1 x1 x2 x3 x4.(a_topic(x1) & on(e1,x4) & n_chalkboard(x4) & Theme(e1,x3) & Actor(e1,x2) & v_spray(e1) & n_graffitus(x3) & (x1 = x2) & n_thug(x1) & card_eq_2(x1))