A man in a purple shirt in front of a woman in a yellow shirt.
A woman is behind a man.
If a man is in front of a woman, then it follows that a woman is behind the man.
exists s1 s2 x1 x2 x3 x4 x5.(a_topic(x1) & in(x1,x2) & in(x2,x3) & of(x3,x4) & in(x4,x5) & n_shirt(x5) & a_yellow(s2) & Theme(s2,x5) & n_woman(x4) & n_front(x3) & n_shirt(x2) & a_purple(s1) & Theme(s1,x2) & n_man(x1))
exists p1 x1.(exists x2.(behind(x1,x2) & n_man(x2)) & n_woman(x1))