A man on a horse throws a lasso at a calf.
A man on a bike chasing a dog.
The man is either on a horse or on a bike and he is either chasing a dog or throws a lasso at a calf.
exists e1 x1 x2 x3 x4.(at(e1,x4) & n_calf(x4) & Theme(e1,x3) & Actor(e1,x1) & v_throw(e1) & n_lasso(x3) & on(x1,x2) & n_horse(x2) & n_man(x1))
exists e1 x1 x2 x3 x4.(a_topic(x1) & on(x1,x2) & Theme(e1,x4) & Actor(e1,x3) & v_chase(e1) & n_dog(x4) & (x2 = x3) & n_bike(x2) & n_man(x1))