Two kids in a green tree.
two kids playing hide and seek inside a green tree
The kids may not be playing.  The activity could be something other than hide and seek.  The kids could be in a location other than inside the tree.
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 e2 e3 e1 e4 s1 x1 x2 x3 x4 x5 x6 x7.(inside(e4,x7) & n_tree(x7) & a_green(s1) & Theme(s1,x7) & Theme(e4,x6) & Actor(e4,x4) & v_seek(e4) & n_thing(x6) & Actor(e3,x5) & v_play(e3) & (x4 = x5) & n_kid(x4) & card_eq_2(x4) & Theme(e2,x3) & Actor(e2,x1) & v_hide(e2) & n_thing(x3) & Actor(e1,x2) & v_play(e1) & (x1 = x2) & n_kid(x1) & card_eq_2(x1))