a janitor is sweeping the floor after a concert.
A man in a blue janitor uniform is cleaning the floor.
It is not completely certain that the man in a blue janitor uniform is, in fact, a janitor.
exists e1 x1 x2 x3.(n_floor(x2) & after(e1,x3) & n_concert(x3) & Theme(e1,x2) & Actor(e1,x1) & v_sweep(e1) & n_janitor(x1))
exists e1 s1 x1 x2 x3 x4.(n_floor(x4) & Theme(e1,x4) & Actor(e1,x1) & v_clean(e1) & in(x1,x2) & n_uniform(x2) & of(x2,x3) & n_janitor(x3) & a_blue(s1) & Theme(s1,x2) & n_man(x1))