A lady in a blue dress singing.
There is a woman.
A woman is a lady.
exists s1 x1 x2 x3.(a_topic(x1) & in(x1,x2) & n_singing(x2) & of(x2,x3) & n_dress(x3) & a_blue(s1) & Theme(s1,x2) & n_lady(x1))
exists p1 x1 x2.((x1 = x2) & n_woman(x2))