Man works on top of scaffolding.
Man is working at the dance floor.
The man can t be working at the dance floor and on scaffolding at the same time.
exists e1 x1 x2 x3.(on(e1,x2) & of(x2,x3) & n_scaffolding(x3) & n_top(x2) & Actor(e1,x1) & v_work(e1) & n_man(x1))
exists e1 x1 x2 x3.(n_floor(x2) & of(x2,x3) & n_dance(x3) & at(e1,x2) & Actor(e1,x1) & v_work(e1) & n_man(x1))