A black dog wearing a harness is pulling a sled.
A black dog wearing a sweater slept on the porch.
The dog cannot simultaneously be wearing and a harness and cannot be both sleeping and pulling a sled
exists e2 e1 s1 x1 x2 x3 x4.(Theme(e2,x4) & Actor(e2,x1) & v_pull(e2) & n_sled(x4) & Theme(e1,x3) & Actor(e1,x2) & v_wear(e1) & n_harness(x3) & (x1 = x2) & n_dog(x1) & a_black(s1) & Theme(s1,x1))
exists e1 s1 x1 x2 x3 x4 x5.(n_porch(x5) & a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_wear(e1) & on(x3,x5) & n_slept(x3) & of(x3,x4) & n_sweater(x4) & (x1 = x2) & n_dog(x1) & a_black(s1) & Theme(s1,x1))