Cowboy riding a bucking horse in a rodeo competition.
He is swimming with others.
riding a horse is contradictory to swimming
exists e1 x1 x2 x3 x4 x5.(ne_nam_cowboy(x1) & in(e1,x4) & n_competition(x4) & of(x4,x5) & n_rodeo(x5) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_horse(x2) & of(x2,x3) & n_bucking(x3))
exists e1 x1 x2.(n_person(x1) & n_male(x1) & with(e1,x2) & -(x2 = x1) & n_person(x2) & Actor(e1,x1) & v_swim(e1))