A person in a biking suit rides a bike down a hill.
There is a girl on the bike.
We don't know that the person is a girl.
exists e1 x1 x2 x3 x4 x5.(Theme(e1,x4) & Actor(e1,x1) & v_ride(e1) & down(x4,x5) & n_hill(x5) & n_bike(x4) & in(x1,x2) & n_suit(x2) & of(x2,x3) & n_biking(x3) & n_person(x1))
exists p1 x1 x3.(n_bike(x3) & exists x2.((x1 = x2) & on(x2,x3) & n_girl(x2)))