A rodeo rider on a bucking horse with a clown in the background.
Rodeo riders are riding the bucking horses.
" riding the bucking horse"  is synonymous with " on a bucking horse" .
exists e1 x1 x2 x3 x4 x5.(n_background(x5) & a_topic(x1) & on(x1,x3) & with(x3,x4) & in(x4,x5) & n_clown(x4) & n_horse(x3) & Actor(e1,x3) & v_buck(e1) & n_rider(x1) & of(x1,x2) & n_rodeo(x2))
exists e1 x1 x2 x3 x4.(n_horse(x3) & of(x3,x4) & n_bucking(x4) & Theme(e1,x3) & Actor(e1,x1) & v_ride(e1) & n_rider(x1) & of(x1,x2) & n_rodeo(x2))