A tan dog is prancing over grass.
A cat is napping by the open window.
One cannot be napping and prancing
exists e1 s1 x1 x2.(over(e1,x2) & n_grass(x2) & Actor(e1,x1) & v_prance(e1) & n_dog(x1) & a_tan(s1) & Theme(s1,x1))
exists e1 s1 x1 x2.(n_window(x2) & a_open(s1) & Theme(s1,x2) & by(e1,x2) & Actor(e1,x1) & v_nap(e1) & n_cat(x1))