A group of men at a parade.
A group of firemen at the Christmas parade.
Not all parades are for Christmas.
exists x1 x2 x3.(a_topic(x1) & of(x1,x2) & at(x2,x3) & n_parade(x3) & n_man(x2) & n_group(x1))
exists x1 x2 x3 x4.(n_parade(x3) & (x3 = x4) & ne_tim_christmas(x4) & a_topic(x1) & at(x1,x3) & of(x1,x2) & n_fireman(x2) & n_group(x1))