A young man is riding his bike on a ramp that is placed within a fenced area.
A bike ramp is empty except for skateboarders.
The bike ramp can't be empty if there is a man riding a bike on said ramp.
exists e1 e2 s1 s2 x1 x2 x3 x4 x5.(on(e1,x3) & within(e2,x5) & n_area(x5) & a_fenced(s2) & Theme(s2,x5) & Theme(e2,x4) & v_place(e2) & (x3 = x4) & n_ramp(x3) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_bike(x2) & of(x2,x1) & n_male(x1) & n_man(x1) & a_young(s1) & Theme(s1,x1))
exists s1 x1 x2 x3.(r_except(s1) & for(s1,x3) & n_skateboarder(x3) & Theme(s1,x1) & a_empty(s1) & n_ramp(x1) & of(x1,x2) & n_bike(x2))