Woman with red-hair wearing black clothes throwing a rock into water.
The red hair is natural.
The hair is not referred to as artificial or natural in sentence 1.
exists e1 e2 s1 s2 s3 x1 x2 x3 x4.(ne_nam_woman(s1) & a_topic(s1) & with(s1,x1) & into(e2,x4) & n_water(x4) & Theme(e2,x3) & Actor(e2,x2) & v_throw(e2) & n_rock(x3) & (x1 = x2) & n_clothes(x1) & a_black(s3) & Theme(s3,x1) & Actor(e1,x1) & v_wear(e1) & a_red-hair(s2) & Theme(s2,x1))
exists s1 s2 x1.(n_hair(x1) & a_red(s1) & Theme(s1,x1) & Theme(s2,x1) & a_natural(s2))