Beautiful blue sky and yellow flowers.
The flowers are sunflowers.
Yellow flowers are not necessarily sunflowers.
exists s1 s2 s3 s4 x1 x2 x3.(n_flower(x2) & a_yellow(s4) & Theme(s4,x2) & a_.(s3) & Theme(s3,x2) & n_sky(x1) & a_blue(s2) & Theme(s2,x1) & (x1 = x3) & ne_nam_beautiful(x3) & subset_of(x2,s1) & subset_of(x1,s1) & a_topic(s1))
exists p1 x1.(n_flower(x1) & exists x2.((x1 = x2) & n_sunflower(x2)))