A couple embraces on a busy street.
A couple waves hello.
The couple that embraces is surely different from the one that waves hello.
exists e1 s1 x1 x2.(on(e1,x2) & n_street(x2) & a_busy(s1) & Theme(s1,x2) & Actor(e1,x1) & v_embrace(e1) & n_couple(x1))
exists x1 x2 x3.(for(x3,x1) & r_hello(x3) & n_event(x3) & n_wave(x1) & of(x1,x2) & n_couple(x2))