Three people watch a fourth draw a chalk portrait on the street.
The street performer is a chalk artist.
Just because a person draws a chalk portrait on the street it does not mean they are a street performer or a chalk artist.
exists x1 x5.(n_street(x5) & all x2 x3.((n_portrait(x2) & of(x2,x3) & n_chalk(x3)) -> exists e1 s1 x4.(Theme(e1,x4) & Actor(e1,x1) & v_watch(e1) & on(x4,x5) & for(x4,x2) & n_draw(x4) & a_fourth(s1) & Theme(s1,x4))) & n_people(x1) & card_eq_3(x1))
exists p1 x1 x2.(n_performer(x1) & of(x1,x2) & n_street(x2) & exists x3 x4.((x1 = x3) & n_artist(x3) & of(x3,x4) & n_chalk(x4)))