Two kids in a green tree.
There is an oak tree.
The tree could be a species other than an oak.
exists s1 x1 x2.(a_topic(x1) & in(x1,x2) & n_tree(x2) & a_green(s1) & Theme(s1,x2) & n_kid(x1) & card_eq_2(x1))
exists p1 x1 x2 x3.((x1 = x2) & n_tree(x2) & of(x2,x3) & n_oak(x3))