A restaurant worker is cleaning a seat.
A restaurant worker is wiping off a seat that had been stained.
Here cleaning a seat is a rephrasing of wiping off a seat that had been stained.
exists e1 x1 x2 x3.(Theme(e1,x3) & Actor(e1,x1) & v_clean(e1) & n_seat(x3) & n_worker(x1) & of(x1,x2) & n_restaurant(x2))
exists e1 e2 s1 x1 x2 x3 x4.(a_off(s1) & Manner(e2,s1) & Theme(e2,x3) & Actor(e2,x1) & v_wipe(e2) & Theme(e1,x4) & v_stain(e1) & (x3 = x4) & n_seat(x3) & n_worker(x1) & of(x1,x2) & n_restaurant(x2))