A woman with a cane walking.
A woman sitting on the couch.
Sitting and walking are the contradiction
exists x1 x2 x3.(a_topic(x1) & with(x1,x2) & n_walking(x2) & of(x2,x3) & n_cane(x3) & n_woman(x1))
exists e1 x1 x2 x3.(n_couch(x3) & a_topic(x1) & on(e1,x3) & Actor(e1,x2) & v_sit(e1) & (x1 = x2) & n_woman(x1))