A smiling child with an orange backpack is holding a bird house.
A frowning child with a blue backpack.
One cannot be frowning and smiling simultaneously. The backpack can either be orange or blue.
exists e1 e2 x1 x2 x3 x4 x5.(Theme(e2,x4) & Actor(e2,x1) & v_hold(e2) & n_house(x4) & of(x4,x5) & n_bird(x5) & with(x1,x2) & n_backpack(x2) & of(x2,x3) & n_orange(x3) & n_child(x1) & Actor(e1,x1) & v_smile(e1))
exists s1 s2 x1 x2.(a_topic(x1) & with(x1,x2) & n_backpack(x2) & a_blue(s2) & Theme(s2,x2) & n_child(x1) & a_frowning(s1) & Theme(s1,x1))