A girl is riding camels on the beach.
A man is riding a horse on the beach.
There is a girl, not a man. The girl is riding a camel, not a horse.
exists e1 x1 x2 x3.(n_beach(x3) & on(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_camel(x2) & n_girl(x1))
exists e1 x1 x2 x3.(n_beach(x3) & on(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_horse(x2) & n_man(x1))