A cowboy balances on his horse in a rodeo.
A cowboy rides a horse.
Someone who balances on his horse is the same as someone who ride a horse
exists s1 x1 x2 x3.(a_topic(x1) & on(x1,x2) & in(x2,x3) & n_rodeo(x3) & n_horse(x2) & of(x2,x1) & n_male(x1) & n_balance(x1) & a_cowboy(s1) & Theme(s1,x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_horse(x2) & n_cowboy(x1))