A man helps a boy ride a bike.
An all girl bike racing competition..
A boy and a girl are different genders and cannot exist simultaneously.
exists x1.(all x2.(n_bike(x2) -> exists e1 x3 x4.(Theme(e1,x3) & Actor(e1,x1) & v_help(e1) & for(x3,x2) & n_ride(x3) & of(x3,x4) & n_boy(x4))) & n_man(x1))
exists x1 x2 x3 x4.(a_topic(x1) & n_competition..(x1) & of(x1,x4) & n_racing(x4) & of(x1,x3) & n_bike(x3) & of(x1,x2) & n_girl(x2))