An audience made up of teenagers.
An audience of teenage boys.
The teenagers may or may not be boys.
exists e1 x1 x2 x3.(a_topic(x1) & r_up(e1) & of(e1,x3) & n_teenager(x3) & Theme(e1,x2) & v_make(e1) & (x1 = x2) & n_audience(x1))
exists x1 x2 x3.(a_topic(x1) & of(x1,x2) & n_boy(x2) & of(x2,x3) & n_teenage(x3) & n_audience(x1))