A baby crawls at a playground.
 A baby crawls in his room.
playground is contradictory to room
exists e1 x1 x2.(at(e1,x2) & n_playground(x2) & Actor(e1,x1) & v_crawl(e1) & n_baby(x1))
exists e1 x1 x2.(in(e1,x2) & n_room(x2) & of(x2,x1) & n_male(x1) & Actor(e1,x1) & v_crawl(e1) & n_baby(x1))