Four people riding horses along beach.
The people are by the beach.
if you are along a beach you are by a beach
exists e1 x1 x2 x3 x4.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_ride(e1) & along(x3,x4) & n_beach(x4) & n_horse(x3) & (x1 = x2) & n_people(x1) & card_eq_4(x1))
exists p1 x1 x2.(n_beach(x2) & n_people(x1) & by(x1,x2))