An gymnast is working the bar.
A trucker is working.
A gymnast and a trucker are not the same occupation
exists e1 x1 x2.(n_bar(x2) & Theme(e1,x2) & Actor(e1,x1) & v_work(e1) & n_gymnast(x1))
exists e1 x1.(Actor(e1,x1) & v_work(e1) & n_trucker(x1))