A cowboy in a pink shirt is riding a bucking horse.
The cowboy is dancing.
The cowboy can not be dancing if he is riding a bucking horse.
exists e1 s1 x1 x2 x3 x4.(Theme(e1,x3) & Actor(e1,x1) & v_ride(e1) & n_horse(x3) & of(x3,x4) & n_bucking(x4) & in(x1,x2) & n_shirt(x2) & a_pink(s1) & Theme(s1,x2) & n_cowboy(x1))
exists e1 x1.(n_cowboy(x1) & Actor(e1,x1) & v_dance(e1))