A wooden fence keeps the horse's safe.
The horse is standing next to the fence.
A horse does not have to be next to the fence in order for the fence to keep horses safe.
exists e1 s1 x1 x2 x3.(n_safe(x3) & of(x3,x2) & n_horse(x2) & Theme(e1,x3) & Actor(e1,x1) & v_keep(e1) & n_fence(x1) & a_wooden(s1) & Theme(s1,x1))
exists e1 x1 x2.(n_fence(x2) & n_horse(x1) & to(e1,x2) & r_next(e1) & Actor(e1,x1) & v_stand(e1))