A girl blows a whistle.
The girl is a referee.
Blowing a whistle does not make you the referee
all x1.(n_whistle(x1) -> exists x2 x3.(a_topic(x2) & for(x2,x1) & n_blow(x2) & of(x2,x3) & n_girl(x3)))
exists p1 x1.(n_girl(x1) & exists x2.((x1 = x2) & n_referee(x2)))