A rock band plays for a crowd of people.
There is a crowd of people.
if the band plays for a crowd then there is a crowd of people
exists e1 x1 x2 x3 x4.(for(e1,x3) & of(x3,x4) & n_people(x4) & n_crowd(x3) & Actor(e1,x1) & v_play(e1) & n_band(x1) & of(x1,x2) & n_rock(x2))
exists p1 x1 x2 x3.((x1 = x2) & of(x2,x3) & n_people(x3) & n_crowd(x2))