There are several trees around the horses.
The horses are in their stalls.
There are trees in a horse stalls.
exists p1 x1 x3.(n_horse(x3) & exists s1 x2.((x1 = x2) & around(x2,x3) & n_tree(x2) & a_several(s1) & Theme(s1,x2)))
exists p1 x1 x2.(n_stall(x2) & of(x2,x1) & n_thing(x1) & n_horse(x1) & in(x1,x2))