A woman wearing a blue dress is drawing a picture of a boy and a girl on the sidewalk with sidewalk chalk.
The boy and girl are brother and sister.
Not all boys and girls together are brother and sister.
exists e1 e2 s1 x1 x2 x3 x4 x5 x6 x7 x8 x9.(with(e2,x9) & n_chalk(x9) & of(x9,x8) & n_sidewalk(x8) & n_sidewalk(x8) & Theme(e2,x4) & Actor(e2,x1) & v_draw(e2) & of(x4,x5) & subset_of(x7,x5) & on(x7,x8) & n_girl(x7) & subset_of(x6,x5) & n_boy(x6) & n_picture(x4) & Theme(e1,x3) & Actor(e1,x2) & v_wear(e1) & n_dress(x3) & a_blue(s1) & Theme(s1,x3) & (x1 = x2) & n_woman(x1))
exists p1 x1 x2 x3.(n_girl(x3) & n_boy(x2) & subset_of(x3,x1) & subset_of(x2,x1) & exists x4 x5 x6.((x1 = x4) & subset_of(x6,x4) & n_sister(x6) & subset_of(x5,x4) & n_brother(x5)))