Triangular blue and red flags flutter in the wind.
The flags are inside a house and all the windows are closed
The flags cannot fluter in the wind if they are inside the house, and all the windows are closed.
exists s1 s2 s3 x1 x2 x3.(n_wind(x3) & a_topic(x1) & in(x1,x3) & n_flutter(x1) & of(x1,x2) & n_flag(x2) & a_red(s3) & Theme(s3,x1) & a_blue(s2) & Theme(s2,x1) & a_triangular(s1) & Theme(s1,x1))
exists p1 x1 x4.(n_window(x4) & n_flag(x1) & all x3.((x3 = x4) -> exists s1.(Theme(s1,x3) & a_closed(s1))) & exists x2.(inside(x1,x2) & n_house(x2)))