A crowd of people around a bike rail.
The group of people are surfing.
The crowd of people cannot be around a bike rail while surfing.
exists x1 x2 x3 x4.(a_topic(x1) & around(x1,x3) & n_rail(x3) & of(x3,x4) & n_bike(x4) & of(x1,x2) & n_people(x2) & n_crowd(x1))
exists e1 x1 x2.(n_group(x1) & Actor(e1,x1) & v_surf(e1) & of(x1,x2) & n_people(x2))