Two skateboarders are on the road with a window full of flags in the background.
Skateboarders are performing stunts in the street.
Skateboarders are not always doing stunts when they are riding.  They might be just riding calmly down the road.
exists p1 x1 x2 x6.(n_background(x6) & n_road(x2) & exists s1 x3 x4 x5.(on(x1,x2) & with(x2,x3) & of(s1,x5) & in(x5,x6) & n_flag(x5) & Theme(s1,x4) & a_full(s1) & (x3 = x4) & n_window(x3)) & n_skateboarder(x1) & card_eq_2(x1))
exists e1 x1 x2 x3.(n_street(x3) & in(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_perform(e1) & n_stunt(x2) & n_skateboarder(x1))